Answers
Answer:
A.H
Explanation:
Related Questions
state the reactants and products of this reaction using this chemical reaction: CH2COOH + NaHCO2 YEILDS CH2COONa + H2O +CO2
Answers
Calculate the actual number of SO4 ions in 14.3 g Cr2(SO4)3.
[0= 16; S=32; Cr=52; NA = 6.02 x 1023],
Answers
n=M/Mr
=14.3/392
= 0.0365 mols
Number of ions = 6.02*10^23 * 0.0365
= 2.20*10^22
The rate constant (k) for a reaction was measured as a function of temperature. A plot of lnk versus 1/T (in K ) is linear and has a slope of − 5780 K. Calculate the activation energy for the reaction
Answers
The value of the rate constants at various temperatures can be measured from the plot of ln K versus 1/T. The activation energy of the reaction obtained from the plot is
What is activation energy?The minimum excess energy that the reactants must acquire so as to have energy equal to the threshold energy for the reaction is defined as the activation energy.
In the plot of ln K versus 1/T the slope obtained is [ -Eₐ / 2.303 R ] and the intercept on the y -axis is equal to log A.
Here the slope in the plot is given as − 5780 K. Then the activation energy is calculated as:
Slope = -Eₐ / R
-5780 K = -Eₐ / 8.314 J/ mol.K
Eₐ = 8.314 J/ mol.K × 5780 K = 48054.9 J/ mol = 48.054 kJ.
Thus the activation energy of the reaction is 48054.9 J/ mol or 48.054 kJ.
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An absorption measurement with a 1 cm path length yields a reading of 0.002 absorbance units with a noise of 0.0005 absorbance units and a mean noise reading of 0 for 5 scans averaged together. Assuming the noise for a single scan does not change if the path length is increased to 5 cm and the number of scans is increase to 65, what is the signal to noise of the new measurement. Remember signal averaging
Answers
Answer:
Assuming the noise remains constant, the total noise for the longer path length, 65 scans should be 0.0005 x 65 = 0.0325 absorbance units. The new reading should be 0.01 absorbance units. The signal to noise ratio (SNR) of the new measurement will be 0.01/0.0325 = 3.08.
Signal averaging decreases the magnitude of the residual noise and increases the SNR. The total noise decreases by the square root of the number of scans, in this case √65 = 8, so for 65 scans, the noise level is 8 times lower than for a single scan.
Suppose that a certain fortunate person has a net worth of $77.0 billion ($ 7.70×1010 ). If her stock has a good year and gains $3.20 billion ( 3.20×109 ) in value, what is her new net worth?
Express your answer to three digits.
Answers
The new net worth of the person is equal to 80.2 × 10⁹.
What are significant digits?Significant figures can be used to generate numbers that will be written in the form of digits. We can also evaluate the number of significant digits by counting the numbers from the 1st non-zero digit placed on the left.
In the case of addition or subtraction, the number of significant figures will be the same as the value with the fewest significant digits.
Given, the net worth of the person, A = 77 billion = $ 77 × 10⁹
The person's stock gains in the following year, I = $ 3.20 billion
I = $ 3.20 × 10⁹
The new net worth of the person, A(new) = A + I
A (new) = 77 × 10⁹ + 3.20 × 10⁹
A (new) = $ 80.2 × 10⁹
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Determine the vapor pressure (in mm Hg) of a substance at 29°C, whose
boiling point is 76°C at 714.6 mm Hg and has a AHvap of 38.7 kJ/mol.
Hint: Use the Clausius-Clapeyron 2-point equation, and R = 8.31 J/K mol
Answers
The vapor pressure of the substance at 29°C is 622.5 mm Hg.
What is vapor pressure?Vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. It is often used as a measure of a substance's ability to vaporize.
The Clausius-Clapeyron equation can be used to calculate the vapor pressure of a substance at a given temperature by using the boiling temperature (Tb) and vapor pressure (Pb) at the boiling point. The equation is given by:
ln(P2/P1) = (AHvap/R)(1/T1 - 1/T2)
where P2 and T2 are the vapor pressure and temperature of interest, P1 and T1 are the vapor pressure and temperature at the boiling point, AHvap is the enthalpy of vaporization, and R is the universal gas constant.
For this problem, we are given T1 = 76°C, P1 = 714.6 mm Hg, AHvap = 38.7 kJ/mol, and R = 8.31 J/K mol. We want to calculate the vapor pressure at T2 = 29°C.
Using the equation above, we can calculate the vapor pressure at T2 as follows:
ln(P2/714.6) = (38.7 kJ/mol)(1/298.15 K - 1/303.15 K)
ln(P2/714.6) = (38.7 kJ/mol)(-0.0033 K-1)
ln(P2/714.6) = -0.128
P2 = e-0.128 x 714.6 = 622.5 mm Hg
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All combustion reactions have oxygen as a reactant. (2 points)
Group of answer choices
True
False
Answers
Answer:
true
Explanation:
They all have a hydrocarbon plus oxygen.
The given statement that "all combustion reactions have oxygen as a reactant" is true. Combustion is a type of chemical reaction where a fuel (usually a hydrocarbon) combines with oxygen gas to produce heat, light, and new chemical compounds, such as carbon dioxide and water.
For combustion to occur, there must be a fuel source, oxygen, and a source of ignition, such as a spark or heat. Oxygen acts as a reactant because it combines with the fuel source to produce the new compounds. Without oxygen, the reaction cannot occur. It is important to note that not all reactions involving oxygen are combustion reactions. For example, rusting of iron is a reaction that involves oxygen, but it is not a combustion reaction.
In combustion reactions, the heat and light produced are often used for industrial processes, transportation, or heating. However, the reaction can also be destructive if not controlled, such as in wildfires or explosions. In conclusion, all combustion reactions have oxygen as a reactant, as it is necessary for the reaction to occur and produce the desired products.
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Iodine-131 has a half-life of 8 hours. If a solution containing 5 grams of iodine-131 is injected into a patient, how long will it take until the total amount of iodine-131 left in the patient is 5 μg (5 micrograms)?
Answers
Step 1
The mass of I-131 left in the body could be calculated as follows:
\(\begin{gathered} M\text{ = M}_0xe^{-\lambda xt} \\ \lambda\text{ = }\frac{ln\text{ 2}}{t_{\frac{1}{2}}} \\ t_{\frac{1}{2\text{ }}}=\text{ half-life} \end{gathered}\)--------
Step 2
Data provided:
M = 5 μg (1 g = 1000000 μg) => 5 μg x (1 g/1000000 μg) = 5x10^-6 g
Mo = 5 g
Half-life = 8 hours = 8 h
-------
Step 3
Procedure:
\(\begin{gathered} \lambda\text{ = }\frac{ln\text{ 2}}{8\text{ h}}=\text{ 0.087 1/h} \\ ---------- \\ M/M_0=\text{ }e^{-0.087\text{ 1/h x t}} \\ \frac{5x10^{-6}}{5}=e^{-0.087\text{ 1/h x t}} \\ ln\text{ }\frac{5x10^{-6}}{5}=-0.087\text{ x t} \\ 159\text{ h = t} \end{gathered}\)Answer: t = 159 h (approx.)
Calculate the number of grams of Ne contained in 18.4 L of Ne gas.
Express your answer to three significant figures and include the appropriate units
Answers
In 18.4 liters of neon gas at STP, you have16.42g of the gas.
A balloon with a 22.4 liter volume at STP contains how many helium atoms?Reason: A MOLAR quantity of gas is defined as a volume of 22.4 L of gas at standard conditions of pressure and temperature (1 atm, 273.15 K). That means, each helium atom has a mass of 6.022 1023.
To determine the value of moles, use the ideal gas law.
The ideal gas law is PV=nRT
T is the temperature in Kelvin which 273 K for standard conditions.
Rearrange the equation to solve for n
n = PV/RT
n = ( 1 atm) ( 18.4L)/[(0.0821 L atm/mol K)(273)]
n=0.821 moles of Neon gas
mass of neon= 0.821*20g
mass of neon= 16.42g
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Thank you in advance.
Answers
The rate expression is k [BF₃]²[NH₃], overall order is 3, rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.
How to calculate rate expression?The rate expression for this reaction can be written as:
Rate = k [BF₃]^m[NH₃]^n
The method of initial rates can be used to calculate the values of m and n. When we compare experiments 1 and 2, notice that halving the concentration of [NH3] reduces the initial rate of reaction. This suggests that the reaction is first order in terms of [NH3], implying that n = 1.
When comparing experiments 1 and 3, notice that increasing the concentration of [BF3] by a factor of 2.5 increases the initial rate of reaction by a factor of 9.39 (i.e., 2.13/0.227). This shows that the reaction is about second order in relation to [BF3], i.e., m 2.
Therefore, the rate expression for the reaction is:
Rate = k [BF₃]²[NH₃]
The overall order of the reaction is m + n = 3.
Using the data from experiment 4, substitute the values and solve for k:
Rate = k [BF₃]²[NH₃]
1.02 × 10-¹ = k (3.00 × 10⁻¹)² (1.00 x 10⁻¹)
k = 1.02 × 10-¹ / (3.00 × 10⁻¹)² (1.00 x 10⁻¹)
k = 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹
Therefore, the rate constant k is 1.13 × 10⁻³ mol⁻² dm⁶ s⁻¹.
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Your computer informs you that this gas follows the Ideal Gas Law (PV =
nRT), and that the units for these calculations are already
accounted for. This means that no conversions are necessary in your
calculations. Some initial values (at time t = 0) are provided below.
=
Pressure (P) = 100 kPa
Volume (V) = 17L
nR (a constant) = 8.3145 kPaL/K
Temperature (T) = 304 K
What value do you provide to your computer for the initial rate of change
of temperature in kelvin/minute?
Answers
dT/dt = - (P * V) / (nR * V)
Plugging in the given values:
dT/dt = - (100 kPa * 17 L) / (8.3145 kPaL/K * 17 L)
dT/dt = - (1700 kPa*L) / (141.3285 kPaL/min)
dT/dt = -12.028 K/min
Therefore, the value we provide to the computer for the initial rate of change of temperature is -12.028 K/min.
Plants go through seasonal changes from summer to fall because temperatures ___________. A: begin to cool daylight hours decrease.
B: begin to cool and daylight hours in increase.
C: warm up in daylight hours decrease.
Or D: warm up, and daylight hours increase.
30 POINTS IF YOU ANSWER THIS QUESTION ALSO, I HAVE 15 MINS
Also, there’s no science so I picked “ chemistry”
Answers
A: begin to cool and daylight hours decrease.
Plants go through seasonal changes from summer to fall because of the changes in temperature and the length of daylight hours. As summer ends and fall begins, temperatures begin to cool down and the days become shorter. This change in temperature and daylight hours triggers physiological changes in plants, such as the slowing down of growth and the production of pigments like anthocyanins, which give leaves their characteristic red and orange colors in the fall. These changes allow the plant to prepare for the colder winter months and conserve energy for the upcoming spring growth season.
Answer:
a. begin to cool and daylight hours decrease
hope this helps ;)
answer each of the following as true or false in a double replacement reaction, if one of the products is insoluble, it is referred to as a precipitate. in a double replacement reaction, the anions and cations of two different molecules switch places, forming two new compounds. a double replacement reaction has two compounds on the reactant and product sides.
Answers
Answer 1: True Answer 2: True Answer 3: False
Some properties of substance X are listed. ●It conducts electricity when molten. ●It has a high melting point. ●It burns in oxygen and the product dissolves in water to give a solution with pH 11. what is X? A a covalent compound B a macromolecule C a metal D an ionic compound
Answers
An ionic compound is one that dissolves in water to produce a solution with a pH of 11, has a high melting point, conducts electricity when molten, and burns in oxygen.
What are ionic compounds, exactly?Positively charged ions, which are sometimes called as cations, and negatively charged ions, also called as anions together constitute an ionic compound, which are neutral substances. The name of the cation is written first, followed by the name of the anion, in case of binary ionic compounds (ionic compounds that only contain two types of elements).
What is the difference between covalent and ionic compounds?An atom can establish bonds with other atoms in two main ways: covalent and ionic. Sharing of electrons between two or more atoms is involved in case of covalent bonding. When two or more ions come together, they can form ionic bonds that are held together by charge differences.
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Why is the primary standard, KHP, used in the determination of the molar mass of an acid?
Answers
Potassium acid phthalate will serve as our primary standard. This is a large molecule (KHC8H4O4) with a molar mass of 204.2 g/mol. Instead of writing the whole formula, we abbreviate it as KHP, where "P" stands for the phthalate ion, C8H4O42-, not for phosphorus. KHP is an acidic substance, with the ionizing hydrogen being set forward in the formula for emphasis. Therefore, KHP is monoprotic and will react with NaOH in a simple 1 to 1 relationship according to the following equation:
In which process do bacteria convert NH4 to NO3 to NO4?|
Answers
The process by which bacteria convert NH4 to NO3 to NO4 is called nitrification.
What is the role of nitrification in the nitrogen cycle? Nitrification is a two-step process where ammonia (NH3) is oxidized to nitrite (NO2) and then to nitrate (NO3). This process is carried out by bacteria known as nitrifying bacteria. Nitrification plays an important role in the nitrogen cycle by converting ammonia and other forms of nitrogen into nitrate, which is a form of nitrogen that can be used by plants for growth. Nitrification also helps to reduce pollution in aquatic environments by converting ammonia-based pollutants into nitrates. Nitrate is then used by organisms in the environment such as algae, which in turn can be consumed by fish and other aquatic organisms. The nitrate can then be converted back into nitrogen gas (N2) and released into the atmosphere, thus completing the nitrogen cycle. Nitrification is an essential part of the nitrogen cycle and is necessary for the proper functioning of the environment.To learn more about nitrification refer to:
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coenzyme q carries electrons between which stages of the electron-transport chain? check all that apply.
Answers
Coenzyme q carries electrons from complex I to complex III and complex II to complex III in the electron-transport chain.
Coenzyme q (CoQ), also known as ubiquinone, is the electron carrier in the electron transport system (ETS) present on the inner membrane of mitochondria.
Ubiquinone is a ubiquitous quinone, which accepts electrons from complex II ( succinate dehydrogenase) and reduces to ubiquinol ( reduced form)
The purpose of the ETS is to generate an H+ ion concentration, by carrying electrons obtained from NADH AND \(FADH_{2}\) produced by the Krebs cycle and glycolysis in the mitochondrial matrix. This H+ ion potential will be used by ATP synthase to generate ATP.
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The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC), which moves electrons from complexes I and II to complex III to provide energy for proton translocation to the intermembrane gap.
What is mitochondria ?An organelle called a mitochondrion can be found in the cells of the majority of Eukaryotes, including mammals, plants, and fungi. Adenosine triphosphate, which is produced by aerobic respiration in mitochondria with their double membrane structure, is used as a source of chemical energy throughout the entire cell.
Coenzyme Q10 takes electrons from reducing equivalents produced during the metabolism of fatty acids and glucose and then transports them to electron acceptors as part of the mitochondrial electron transport chain.
Ubiquinone, also known as coenzyme Q, is a lipophilic molecule that is found in all tissues and cells and is mostly found in the inner mitochondrial membrane. It is generally known that Coenzyme Q is an essential part of the oxidative phosphorylation process in mitochondria.
Thus, The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC).
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A geologist conducts an investigation to determine the absolute age of a fossil. She then
repeats the procedure three times. Which BEST explains why she repeated the procedure
several times? (SC.6.N.1.1)
It helps her develop better procedures
It improves the accuracy of the results.
She wants all the results to be different.
She has more than one hypothesis to prove.
Answers
Answer:
Explanation:
Hehs
How many liters of a 0.200 M sodium cyanide solution would be needed to react with 45.0kg of rocks that contain 2.00% by mass of gold?
Answers
There are 91.84L of a 0.200 M sodium cyanide solution would be needed to react with 45.0kg of rocks that contain 2.00% by mass of gold
Percentage weight by weightThe formula for % w/w is mass of solute /mass of solution*100
Substituting the values in the equation
2%= mass of solute/45000 *100
mass of solute= 2*45000/100
mass of solute = 900 gram
Now, to calculate the volume we use the molarity given
molecular weight of sodium cyanide is 49 g/mol
Molarity= mass of solute/molecular mass *volume
0.2=900/49* volume
volume= 900/49*0.2
volume= 91.84 liter
The mass percentage of a solute in solution is the percent concentration of a substance (solute) in solution when it is stated as 'w/w'. This phrase is frequently used when the solute and solution are weighted.
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what is science?
its in my book name "what is science"
so explain me if you know "what is science"
Answers
Hi! Science stands for “Systematic Comprehensive Investigation and Exploration of Nature Causes and Effects”.
What is science?
Science is the systematic study of the structure and behavior of the physical natural world. It is also use for experience or can say it is an experience. Scientists are people who test science/experiments for the worlds. Science really is just the study of the nature. Science use math em empathic and logic, which are sometimes called “formal science”.
Answer:
As scientist discovered that Science is the method of learning everything about the natural world.
The element tellurium would be expected to form covalent bond(s) in order to obey the octet rule.
Answers
As per the octet rule, the element tellurium will make 2 covalent bonds to complete it's octet.
What is octet rule?
The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons in the outermost shell are more likely to interact with one another and create better stable molecules. We ignore d or f electrons while considering the octet rule. The octet rule is useful for main group elements (those not in the transition metal or inner-transition metal blocks) since it only involves the s and p electrons. An octet in these atoms corresponds to an electron configuration ending in s2p6.
According to octet rule, an element require to complete it's octet (i.e. 8 electrons in the outermost shell). So, in the case of tellurium there are 6 electrons in the outermost shell therefore, we require two more electrons to complete the octet for which the tellurium would be expected to make 2 covalent bonds.
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How much did asbestos exposure decrease during the year 1982 and 1983
Answers
The asbestos exposure during the years 1982 and 1983 was 2.5 fibers per cubic centimeter and 0.8 fibers per cubic centimeter respectively. So asbestos exposure decreased by 1.7 fibers per cubic centimeter during the year 1983.
Breathlessness Persistent, dry cough Chest pain or tightness Lack of a dry, crackling sound in the lungs when you breathe in Wider and rounder fingers and toes are some of the symptoms of asbestos exposure.
The largest group of people exposed to asbestos is those working in the construction industry. Historically, asbestos was also used by pipe fitters and shipyard workers. In addition, asbestos was used by military personnel, auto mechanics, and many other occupations.
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A box measures 8.54 ft in length, 0.0455 yd in width and 9.18 inches in height. What is its volume in cubic centimeters (cm3)?
1 yard = 3 ft 1 in = 2.54 cm 1 ft = 12 in
HINT: Break each given number down SEPARATELY. So 3 different dimensional analysis converting each number to centimeters. THEN take those 3 converted numbers for length, width and height and plug them into the volume equation. Volume = length x width x height. If you think about the units of centimeters being multiplied by each other (cm x cm x cm) in the volume equation, they all combine to form cubic centimeters (cm3).
Answers
The volume in cubic centimeters is 25251.17cm³
Volume measures capacity. So the unit of volume is basically a unit for measuring the capacity or the extent of an object or space. The unit is mostly used to specify the volume of goods or a liquid (fluids).
In this problem, volume of the box is given by the formula:
V = l x w x h
Solving the problem
First, let us convert every dimension to centimeter.
l = 8.54 ft x 12 inches x 2.54 cm = 260.29 cm
w = 0.0455 yd x 3ft x 12 inch x 2.54 cm = 4.16052cm
h = 9.18 in x 2.54 cm = 23.3172 cm
Now, we can solve for the volume of the box using the given formula above.
V = l x w x h
Then substitute the given data
V = (260.29 cm) x (4.16052 cm) x (23.3172 cm)
V = 25251.17cm³
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The table shows several useful salts formed from reactions between different acids and bases. In order, these salts are used to control dust on roads, absorb water in antiperspirants, disinfect materials, and detect radiation. Use the pattern shown in the table to answer the question.
Name of Salt Formula of Acid Formula of Base Formula of Salt
Magnesium chloride HCl Mg(OH)2 MgCl2
Aluminum nitrate HNO3 Al(OH)3 Al(NO3)3
Sodium bromide HBr NaOH NaBr
Lithium fluoride ? ? LiF
Which two formulas will correctly complete the table for lithium fluoride?
Answers
The chemical formula of salt can be easily understood from the formulas of the acid and base from which it is formed. The salt LiF is formed from the acid LiOH and HF.
What is acid-base reaction ?An acid -base reaction is called neutralization reaction because, the acidity and basicity of the two compounds is vanishing. Neutralization reactions gives the product called salts.
Acids donate their protons to the base and bases donate their electrons to acids forming the salt.
Lithium fluoride is salt formed from the acid -base reaction of hydrofluoric acid and lithium hydroxide. the reaction can be written as:
LiOH + HF → LiF + H₂O
Hence. the two missing formulas are LiOH and HF.
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The density of Diamond is 3.51 g/cm3, and the density of platinum is 21.43 g/cm3. If equal masses of diamond and platinum are transferred to equal volumes of water in separated graduated cylinders, which graduated cylinder would have the greatest volume change
Answers
Answer:
Explanation:
Diamond has lesser density than platinum . So , if we take equal mass of both , the volume of mass of platinum will be far less .
The density of both diamond and platinum are more than water so both of them will be drowned in water completely . They will not float . On being drowned , platinum will displace lesser volume of water because of its less volume . So volume change in case of platinum mass will be far less . The volume change for diamond will be more because of its bigger size.
How much time is required for an object moving 4.5m/s to travel 65 m
Answers
Answer:
About 14.45 seconds
Explanation:
If a object is going 4.5m/s and its destination is 65m then you need to divide.
65÷4.5 = 14.444444
due to the constant 4 you need to round 14.444 so it would be 14.45 seconds.
In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated.
What most likely occurred during this demonstration?
a.The Zn and HCl both retained their identity.
b.Either Zn or HCl, but not both, retained its identity.
c.Evaporation of one of the substances occurred.
d.One or more new substances formed.
Answers
Answer:
a. The Zn and HCl both retained their identity.
State the conditions necessary to convert 1 bromopropane into propene
Answers
Answer:
By the process of dehydrohalogenation in the presence of alcoholic KOH.
Answer:
Aqueous Alkali in presence with reflux alcohol.
For example
- Alkali can be potassium hydroxide or sodium hydroxide.
- Alcohol can be ethanol.
PLS GUYS HELP!!!! Examine the table with the distances and times recorded for five different trains. Calculate the average speed for each train and select the correct answer choices. Select ALL that apply.
Answers
Answer:
A: Train I had the fastest average speed
C: Trains II and V had the same average speed
E: Trains III and IV had the same average speed
Explanation:
convert each into decimal form.
a) 1.56× 10^3
b) 0.56×10-4
Answers
Answer: A = 1560
B = 1.6
Explanation: brainlest please