Answers
Answer:
0.354 molal
Explanation:
The molarity (M) or the concentration of a solution is defined as the number of moles of a compound in the solution per liter of solution (mol/L), whereas molality, is defined as the number of moles of a compound in the solution per kg of the compound (mol/kg).
Given that the density of the solution is 1.202 g/mL, which is equivalent to 1.202 kg/L. Since the prefix mili- denotes a factor of one thousandth ( \(10^{-3}\) ) and kilo- denotes a factor of one thousand ( \({10}^3\) ),
\(1.202 \ \frac{g}{mL} \ = \ 1.202 \ \frac{g}{(10^{-3}) L} \ = \ 1.202 \ \frac{{10}^3g}{L} \ = \ 1.202 \ \frac{kg}{L}\).
To calculate the corresponding molality of the solution, the formula
\(Molality \ (mol/kg) \ = \ \frac{Molarity \ (mol/L)}{Density \ (kg/L)}\) is used.
Therefore,
\(Molality \ = \ \frac{0.426 \ mol/L}{1.202 \ kg/L} \ = \ 0.354 \ mol/kg \ \ (3 \ s.f.)\)
Related Questions
You have 400,000 atoms of a radioactive substance. After 3 half-lives have past, how many atoms remain? Remember that you cannot have a fraction of an atom, so round the answer to the nearest whole number.
Answers
Answer:
Explanation:
The number of atoms that remains after 3 half-lives given that it was originally 300000 atoms is 37500 atoms
Data obtained from the question
Original amount (N₀) = 300000 atoms
Number of half-lives (n) = 3
Amount remaining (N) =?
How to determine the amount remaining
The amount remaining after 3 half-lives can be obtained as illustrated below:
N = N₀ / 2ⁿ
N = 300000 / 2³
N = 300000 / 8
N = 37500 atoms
25 points and I’ll mark as brainliest!!! Tasks are in the picture.
Answers
5. There are 5.67 grams of HBr dissolved in 700 mL of the solution with pH of 2.
6. There are 1000 times more hydrogen ions in a solution with a pH of 3 than in a solution with a pH of 6.; option D.
How many grams of HBr are dissolved in 700 mL in the solution with pH of 2?The grams of HBr dissolved in 700 mL of a solution with pH of 2 is determined as follows;
pH = -log[H+]
2 = -log[H+]
[H+] = 10⁻² mol/L
HBr is a strong acid and dissociates completely in water to give H+ and Br- ions as follows:
HBr → H+ + Br-
The concentration of HBr in the solution will then be equal to the concentration of H+ ions.
[HBr] = 10⁻² mol/L
The mass of HBr is then determined using the formula:
mass = concentration x volume x molar massThe molar mass of HBr is 80.91 g/mol.
mass = 10⁻² mol/L x 0.7 L x 80.91 g/mol
mass = 5.67 g
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How many sodium atoms are
present in one formula unit of
sodium chromate?
1
4
7
2
Answers
The number of sodium atoms in a formula unit of the sodium chromate is 2.
How many sodium atoms are present?We know that the formula of a compound is the way that we can be able to know the atoms that we can find in the compound. The chemical formula shows the number of atoms of each of the elements that is present.
Now let us look at the formula unit of of sodium chromate as we have shown in the image that is attached to this answer. It shows us the number of the oxygen, sodium and the chromium atoms that we have in a formula unit of the sodium chromate.
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QUESTION 8 1 POINT
Which of the following statements does not accurately describe the precision of a measurement?
Select the correct answer below:
The precision is a measure of the spread of expected values for a given measurement.
The precision describes the closeness of replicate measurements of the same property.
The precision can be quantified as the standard deviation of a set of data.
The trueness is a measure of how close a measurement is to an accepted value.
Answers
The statements 'The precision is a measure of the spread of expected values for a given measurement .' does not accurately describe the precision of a measurement .
Precision refers to how close measurements of the same item are to each other . Precision is independent of accuracy . That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise . The best quality scientific observations are both accurate and precise .
It is also define in one term as the quality or state of being precise .
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I don't understand what the "amplitude" is?
Answers
In physics and mathematics, amplitude refers to the maximum displacement or distance that an oscillating or vibrating object or wave reaches from its equilibrium position.
For example, in the case of a simple harmonic motion (like a mass attached to a spring), the amplitude is the maximum displacement from the equilibrium position (i.e., the position where the spring is neither compressed nor stretched).
In the case of a wave, such as a sound wave or a light wave, the amplitude is the maximum distance that any part of the wave travels from its resting position (i.e., the position where there is no wave).
The amplitude is usually measured in units of distance, such as meters or feet, or in units of some other physical quantity that is related to distance, such as pressure or electric field strength.
A sample of water weighing 523g is cooled by 23C. Calculate the q value for this process.
Answers
Answer:
The q value for this process is -241.69 kJ.
Explanation:
To calculate the q value, we need to use the equation:
q = m * c * ΔT
where:
q is the heat energy absorbed or released,
m is the mass of the substance,
c is the specific heat capacity of the substance,
ΔT is the change in temperature.
In this case, the mass of the water (m) is given as 0.523 kg, the change in temperature (ΔT) is 23°C, and the specific heat capacity of water (c) is approximately 4.18 kJ/kg°C.
Substituting the values into the equation:
q = 0.523 kg * 4.18 kJ/kg°C * 23°C
q = 5.46 kJ * 23°C
q = -125.58 kJ
The negative sign indicates that heat is being released from the water as it cools. Therefore, the q value for this process is -125.58 kJ or approximately -241.69 kJ (rounded to two decimal places).
How many moles of helium gas are present in a balloon with a volume of 950 ml a pressure of 3.47 atm and a temperature of 104 degrees celcius
Answers
Answer:
.107 moles
Explanation:
To find moles given the info above, we use a variation of the Ideal Gas Law,
mol = PV/RT, where P is in atm, V is in L, T is in K, and R is the gas constant
P=3.47 atmL= .950 LT= 377 KR= .08206mol= 3.47(.950) / 377(.08206)
=.107 moles H26.02 x 10^23 in standard form
Answers
Iodine 131, cesium 137, and strontium 90 are all considered isotopes. What are isotopes?
Answers
Answer:
Isotopes are variants of an element, where the number of neutrons is different but its number of protons stay the same.
Explanation:
If the number of protons had changed then it would just be a different element.
Electron number changing simply adds charge to the atom, and doesn't change it or anything.
PLS GIVE BRAINLIEST
Answer:
Isotopes are one of two or more forms of the same chemical element.
Explanation:
Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number,but a different number of neutrons giving each element isotope of a different atomic weight.
write the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answers
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
Convert 23 degrees F to
degrees C.
[?] °C
Tin degrees C
Enter
![Convert 23 degrees F todegrees C.[?] CTin degrees CEnter](https://i5t5.c14.e2-1.dev/h-images-qa/contents/attachments/e6OEzbXe6pX5j2kCW2u4vIUsppuAKABA.png)
Answers
23 degrees Fahrenheit equals -5 degrees Celsius!
Also heres a free meme
![Convert 23 degrees F todegrees C.[?] CTin degrees CEnter](https://i5t5.c14.e2-1.dev/h-images-qa/answers/attachments/wEEGnlZzgxIngC6C3MAseQDxUZvTQsHy.jpeg)
predict the direction favored of the following equilibrium equation
Answers
Comparing the stabilities of two negative charges on opposite sides of the equilibrium-arrows is one method for determining whether the reactants or products are preferred in an equilibrium. Because this side has less energy, it is preferred, whichever side has the more stable negative charge.
How do you know which side is favored at equilibrium?It is well knowledge that nature prefers low energy conditions. Remember that we may use the Protocol to compare the stability of two negative charges, where the more stable negative charge has a lower energy, and that this evaluation can be done while keeping this concept in mind.Comparing the stabilities of two negative charges on opposite sides of the equilibrium-arrows is one method for determining whether the reactants or products are preferred in an equilibrium. Because this side has less energy, it is preferred, whichever side has the more stable negative charge.Considering what transpires once you reach the more stable negative charge is one method to understand why this assertion is correct.Because you are content with where you are—a place of low energy—if you have recently moved to a more solid job, you are less likely to react negatively.By contrasting the negative charges on an oxygen and a nitrogen in the aforementioned example, we are putting the protocol to use. Since the charges on two atoms in the same row of the periodic table are being compared, we use electronegativity (#2 on the Protocol) to ascertain the relative stabilities.To Learn more About equilibrium refer To:
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which of the following causes acid rain?
Answers
Answer:
acid and rain
Explanation:
acid rain
Answer:
acid rain is checimal reaction to sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Bascalliy it's because of sulfur dioxide and nitrogen
Explanation:
The smallest particle of an element that retains the properties of that element is a(n)
proton
neutron
electron
atom
Answers
Answer: atom
Explanation:
It makes the most sense to me anyways seeing that an atom contains protons electrons and neutrons in it already
Given the following equation: Mg + 2HCI → MgCl₂ + H₂
How many moles of H₂ can be produced by reacting 2 moles
of HCI?
Answers
Taking into account the reaction stoichiometry, 1 mole of H₂ can be produced by reacting 2 moles of HCI.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → MgCl₂ + H₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 moleHCl: 2 molesMgCl₂: 1 moleH₂: 1 moleMoles of H₂ producedBy reaction stoichiometry 2 moles of HCl form 1 mole of H₂.
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Plz help me ASAP in my final project I am ready to pay 20$
Answers
Answer:
what do you need help with
Consider the compound hydrazine N2H4 (MW = 32.0 amu). It can react with I2 (MW = 253.8 amu) by the following reaction 2 I2 + N2H4 ------------- 4 HI + N2 (a) How many grams of I2 are needed to react with 36.7 g of N2H4? (b) How many grams of HI (MW = 127.9 amu) are produced from the reaction of 115.7 g of N2H4 with excess iodine?
Answers
Answer:Cobb
Explanation:What y'all
Think of other muscles in your body, besides your heart, that work without you thinking about them. How do the functions of these muscies differ from ones you consciously control?
Answers
Answer:
Smooth Muscles - Smooth muscles are special muscles that don't connect to bones, but control organs within our body. These muscles work without us having to think about them.Explanation:
Sana makatulong heart and follow po and pa brainliest thnksDraw the product you expect from the reaction of (R)-2-bromooctane with -CH3CO2- and Br-.. Use the wedge/hash bond tools to indicate stereochemistry where it exists. Include H atoms at chiral centers only. If a group is achiral, do not use wedged or hashed bonds on it.
Answers
From the mechanism shown, the major product of the reaction is (S)-(+)-2-octanol.
What is an SN2 reaction?An SN2 reaction is one in which there is an inversion of configuration and the attack of the nucleophile occurs from behind the substrate.
As shown in the mechanism attached here, the major product of this reaction is (S)-(+)-2-octanol.
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The German
(1868-1934;
Prize in
Chemistry
1918) was
able to
synthesize ammonia (NH3) by
reacting 0.1248 M H₂ and 0.0416 M
N₂ at about 500°C. At equilibrium, the
mixture contained 0.00272 M NH3.
What is K for the reaction N₂ + 3H₂ =
2NH3at this temperature? What is Kp?
chemist Fritz Haber
Nobel
Answers
At 298 K, the reaction N2(g) + 3H2(g) 2NH3(g) results in an enthalpy change (H) of -92.38 kJ.
What is the effect of temperature on the equilibrium N2 3H2 ⇋ 2NH3?N2(g) + 3H2(g) 2NH3(g) + Heat is the equation for our equilibrium reaction. Think about increasing the nitrogen gas concentration. Since the reaction is pushed to the right when nitrogen gas concentration is increased, we may be certain that the equilibrium will shift to the right.Kp for the N2 + 3H2 2NH3 reaction at 400°C is 1.64 10-4. Iron catalyst addition will not change the reaction's state of equilibrium. The general statement: Kp = Kc(RT) (RT) It is possible to derive n by taking into account the moles of gaseous products and reactants.N2 (g) + 3 H2 (g) 2 NH3 (g) If equal amounts of each reactant are utilised, hydrogen will be the limiting agent because it takes 3 moles of hydrogen to produce 1 mole of ammonia.To learn more about enthalpy refer to:
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Why does it mean by methane molecule is symmetrical?
Answers
A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.
Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.
Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.
Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.
Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.
The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.
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What other organisms feed on the same material?
Answers
Answer:
A heterotroph is an organism that eats other plants or animals for energy and nutrients. The term stems from the Greek words hetero for “other” and trophe for “nourishment.”
2 examples of metal’s catalytic reaction
Answers
Answer:
Example 1
palladium(II) nitrate,
Example 2
Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.
Explanation
The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.
By what factor would the average kinetic energy of the particles be increased if the
temperature a substance was increased from -49C to 287C?
Answers
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the new kinetic energy is 48 times the original kinetic energy.
What is kinetic energy?
It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy
Average kinetic energy is directly proportional to temperature. It is not dependent on the type of gases or mass of gases
Mathematically,
K.E=2/3KT
Where,
K= Boltzmann constant
T is the temperature
Gases at higher temperature will have higher average kinetic energy. For every 10 degree rise in temperature, kinetic energy of reaction gets double. There are 24 times 10 between the given temperature -49C to 287C. So, the new kinetic energy is 48 times the original kinetic energy.
Therefore, the new kinetic energy is 48 times the original kinetic energy.
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Name two indicators used in quantitative analysis.
Answers
1. Standard deviation: It measures the variation or volatility of the data points in a dataset. It is calculated by taking the square root of the variance. The higher the standard deviation, the more dispersed the data points are from the average. In finance, standard deviation is often used to measure the risk associated with investments. Higher standard deviation indicates higher risk.
2. Correlation coefficient: It measures the strength of the relationship between two variables. It is calculated by dividing the covariance between the two variables by the product of their standard deviations. Correlation coefficient can range from -1 to 1, where -1 indicates a perfect negative correlation, 0 indicates no correlation, and 1 indicates a perfect positive correlation. Correlation coefficient is often used in finance to assess the relationship between two stocks or other financial instruments. A higher correlation coefficient indicates a stronger relationship between the variables being compared.
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Task:
For each "station", click on the link. You should describe the initial appearances and observations of the
reaction during and after. Using your observations, determine if the change is a physical or chemical change.
Station #1: Lead Nitrate and Potassium lodide solutions. Shower of yellow
QUESTION/OBSERVATION
INITIAL APPEARANCE (what does the
substance look like in the beginning)
Answers
The expected observations for the chemical reaction involving lead nitrate and potassium iodide are as follows as per theory.
INITIAL APPEARANCE:Before the reaction, you'd have two separate solutions:
Lead Nitrate solution: This is typically a clear, colorless solution.
Potassium Iodide solution: This is also usually a clear, colorless solution.
REACTION OBSERVATIONS:
As soon as you combine these two solutions, a chemical response takes place, resulting in the almost instantaneous development of a yellow precipitate. Lead iodide is a substance that cannot be dissolved in water.
FINAL APPEARANCE:
The final mixture would have a yellow precipitate (lead iodide) suspended in the solution.
The reaction leads to the formation of lead iodide, a substance with distinctive properties, suggesting a chemical change. The presence of this novel compound is indicated by the yellow hue of the precipitate.
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What volume will 2.91 moles of nitrogen occupy at 1.50 atm and 23°C?
Answers
A container with a volume of nitrogen gas is filled to 1.50 atm of pressure and 23°C of temperature. Compute the amount of gas in moles led with as at 2.91 moles is 18.87 liters.
The three gas laws that make up the combined gas law, also known as a general gas equation, are Charle's law, Boyle's law, and Gay-Lussac law. The law shows the link between temperature, volume, and pressure for a given amount of gas.
PR/T=V
V= 2.91×150/23
V=18.87liters
According to Boyle's Law, gas volume increases as pressure lowers. Charles' Law states that a gas expands as its temperature rises. Also, according to Avogadro's Law, a gas's volume increases as its concentration does.
The area occupied by a gas.The pressure a gas exerts against the container's walls.The actual temperature of the gas.Either the total amount of gaseous substance or the number of gas moles.
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What model is represented
Answers
A___
is a
small, rocky object
that orbits the sun
and has broken
off from a comet
or asteroid.
(Fill in the blank)
Answers
Answer:
I think it is a rock...
Explanation:
maybe idrk tho
What are three ways chemist can control chemical reactions paragraph or explanations
Answers
Answer:
Chemists can control rates of reactions by changing factors such as surface area, temperature, and concentration and by using substances called catalysts and inhibitions.
I think