Answers
The number of gold atoms is 1.590x10^23.
- First, with the molar mass of Au2Cl6 (607g/mol) we can find the grams of Au in 80g of Au2Cl6:
\(\begin{gathered} 607g\text{ of Au2Cl6 \_\_\_\_\_\_ 394g of Au} \\ 80g\text{ of Au2Cl6 \_\_\_\_\_\_ x= }\frac{80g.394g}{607g} \\ x=\text{ 51.93g} \end{gathered}\)Now we know that there are 51.93g of Au in 80g of Au2Cl6.
- Second, with the molar mass of gold (197g/mol) we can calculate the number of moles in 51.93g of gold:
\(\begin{gathered} 197g\text{ \_\_\_\_\_ 1mol} \\ 51.93g\text{ \_\_\_\_ x= }\frac{51.93g.1mol}{197g} \\ x=0.264\text{mol} \end{gathered}\)Now we know that there are 0.264 moles of gold in the sample.
- Third, with the Avogadro's number (6.022*10^23) we can calculate the number of gold atoms in the sample:
\(\frac{0.264mol.\mleft(6.022x10^{23}\mright)}{1\text{mol}}=1.590x10^{23}\)So, the number of gold atoms is 1.590x10^23.
Related Questions
Build the molecular models of the compounds listed below and draw the Fischer projection for each of them. In the Fischer projection when the compound has more than one stereogenic center the longest carbon chain is drawn from top to bottom (vertical), with the functional group carbon at the top (top). Identify the pairs of molecules that represent enantiomers and diastereomers and identify each stereogenic center by writing R or S next to it.
Answers
The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. Enantiomers have the same chemical and physical properties, except for their interaction with polarized light. Enantiomers have opposite configurations at every stereogenic center, so they have opposite R or S designations.
Diastereomers, on the other hand, are stereoisomers that are not mirror images of each other. Diastereomers have different physical and chemical properties, and they have different configurations at one or more stereogenic centers. Unlike enantiomers, diastereomers do not have opposite R or S designations.
To identify stereogenic centers in a molecule, one needs to determine the number of different substituents attached to a carbon atom. The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
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A 0.250 mol sample of gas at 35.0°C exerts a pressure of 700 torr in it's container. What pressure will the container exert if the volume expands to 10.0L and the temperature is cooled to 5.0°C?
Answers
1.Chlorobenzene, C6H5Cl, is used in the production of chemicals such as aspirin and dyes. One way that chlorobenzene is prepared is by reacting benzene, C6H6, with chlorine gas according to the following BALANCED equation.
C6H6 (l) + Cl2 (g) C6H5Cl (s) + HCl (g)a.
What is the theoretical yield if 45.6 g of benzene react?
Answers
Answer:
\(m_{C_6H_5Cl}=65.7gC_6H_5Cl\)
Explanation:
Hello!
In this case, according to the given balanced chemical reaction:
\(C_6H_6 (l) + Cl_2 (g) \rightarrow C_6H_5Cl (s) + HCl (g)\)
We can see there is 1:1 between benzene and chlorobenzene as the relavant product; thus, since the molar mass of benzene is 78.11 g/mol and that of chlorobenzene is 112.55 g/mol, the theoretical yield for this reaction turns out:
\(m_{C_6H_5Cl}=45.6gC_6H_6*\frac{1molC_6H_6}{78.11gC_6H_6 }*\frac{1molC_6H_5Cl}{1molC_6H_6}*\frac{112.55gC_6H_5Cl}{1molC_6H_5Cl} \\\\m_{C_6H_5Cl}=65.7gC_6H_5Cl\)
Best regards!
A sample of gas has a pressure of 750 mmHg at 25⁰C what would the new pressure be if the temperature is increased to 125⁰C?
Answers
ANSWER
The final pressure of the gas is 1001.6 mmHg
EXPLANATION
Given that;
The pressure of the gas is 750 mmHg
The temperature of the gas is 25 degrees celcius
The final temperature of the gas is 125 degrees Celcius
Follow the steps below to find the final pressure of the gas
In the given data, the volume of the gas is fixed, hence, we can apply Gay Lussac's law to find the final pressure of the gas
Step 1; States the Gay Lussac's law
Gay Lussac's a gas law which states that the pressure exerted by a gas (of a given mass and kept at a constant volume) varies directly with the absolute temperature of the gas.
Mathematically, this can be expressed as
\(\text{ }\frac{\text{ P1}}{\text{ T1}}\text{ = }\frac{\text{ P2}}{\text{ T2}}\)Step 2: Convert the temperature to degrees Kelvin
\(\begin{gathered} \text{ T = t}\degree C\text{ + 273.15} \\ \text{ for t1 = 25} \\ \text{ T= 25 + 273.15} \\ \text{ T = 298.15K} \\ \\ \text{ for t2= 125}\degree C \\ \text{ T = 125 + 273.15} \\ \text{ T = 398.15K} \end{gathered}\)Step 3: Substitute the given data into the formula in step 1
\(\begin{gathered} \text{ }\frac{\text{ 750}}{\text{ 298.15}}\text{ = }\frac{\text{ P2}}{\text{ 398.15}} \\ \\ \text{ Cross multiply} \\ \text{ 750}\times\text{ 398.15 = 298.15 }\times\text{ P2} \\ \text{ 298612.5 = 298.15P2} \\ \text{ Divide both sides by 298.15} \\ \text{ }\frac{\text{ 298612.5}}{\text{ 298.15}}\text{ = }\frac{\text{ 298.15P2}}{\text{ 298.15}} \\ \text{ P2 = 1001.6 mmHg} \end{gathered}\)Therefore, the final pressure of the gas is 1001.6 mmHg
b) Ammonia and sulfuric acid react according to the equation given below. How many millilitres of 0.110 M sulfuric acid are required to neutralize exactly 25.0 mL of 0.0840 M NH3 solution? 2 NH3(aq) + H₂SO4 (aq) → (NH4)2SO4(aq)
Answers
The amount of 0.110 M sulfuric acid are required to neutralize exactly 25.0 mL of 0.0840 M NH3 solution is 9.55mL.
A Neutralization Reaction: What Is It?A neutralisation reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products. H+ ions and OH- ions combine to generate water during a neutralisation process.
2 NH3(aq) + H₂SO4 (aq) → (NH4)2SO4(aq)
moles of NH3 = (25ml x 1L/1000mL) x 0.084M
=> 2.1x 10^(-3) moles
The mole ratio of NH3 to H₂SO4 in the given reaction
=> moles of H₂SO4 = 2.1 x 10^(-3) moles of NH3 x 1 molesH₂SO4/2 moles
NH3
=> 1.05 x 10^(-3) moles
Volume = moles/molarity
=> 1.05 10^(-3) moles/0.110M
=> 9.55 x 10^(-3) L = 9.55mL
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HELP ASAP 100 pts - If 6.0 moles of zinc react with 6.0 moles of hydrochloric acid in the equation Zn + 2HCI —> ZnCl2 + H2, what is the limiting reactant? (please explain as well)
A) H2
B) Zn
C) ZnCl2
D) HCl
Answers
The balanced equation for the reaction is:
Zn + 2HCl → ZnCl2 + H2
According to the stoichiometry of the equation, 1 mole of Zn reacts with 2 moles of HCl to produce 1 mole of H2 and 1 mole of ZnCl2.
Therefore, if 6.0 moles of Zn react with 6.0 moles of HCl, we need 12.0 moles of HCl to react completely with all the Zn. This means that HCl is the limiting reactant, as there are not enough moles of HCl to react with all the Zn.
So, the answer is (D) HCl.
What compound has 4 hydrogen atoms and one carbon
Answers
Carbon atoms may thus form bonds to as many as four other atoms. For example, in methane (CH 4start subscript, 4, end subscript), carbon forms covalent bonds with four hydrogen atoms
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You breed poodles and notice there is bimodal distribution of poodle heights in your kennel. One group, with contains 24 dogs, averages 20.5 inches, another group that contains 12 dogs, averages 32.1 inches. What is the average height of the poodle in you kennel?
Answers
The average height of the poodle in your kennel is 1.46.
What is the average?The term average has to do with the mean value of something now we have been told that one group, with contains 24 dogs, averages 20.5 inches, another group that contains 12 dogs, averages 32.1 inches.
The first group has 24 dogs and the second group has 12 dogs the total number of dogs is 24 + 12 = 36 dogs. The total height of the dogs is 20.5 inches + 32.1 inches = 52.6 inches
The average height of the poodle in your kennel = 52.6 inches/36 dogs
= 1.46
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Calcium carbonate decomposes to form calcium oxide and carbon dioxide, like this:
CaCO3(s)→CaO(s)+CO2(g)
At a certain temperature, a chemist finds that a 9.0L reaction vessel containing a mixture of calcium carbonate, calcium oxide, and carbon dioxide at equilibrium has the following composition:
Compound Amount
CaCO3 25.3 g
CaO 14.9 g
CO2 33.7 g
Calculate the value of the equilibrium constant Kc for this reaction. Round your answer to 2 significant digits.
Answers
Answer: The value of the equilibrium constant Kc for this reaction is 0.088
Explanation:
\(Molarity=\frac{x}{M\times V_s}\)
where,
x = given mass
M = molar mass
\(V_s\) = volume of solution in L
Equilibrium concentration of \(CaCO_3\) = \(\frac{25.3}{100\times 9.0}=0.028M\)
Equilibrium concentration of \(CaO\) = \(\frac{14.9}{56\times 9.0}=0.029M\)
Equilibrium concentration of \(CO_2\) = \(\frac{33.7}{44\times 9.0}=0.085M\)
The given balanced equilibrium reaction is,
\(CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)\)
The expression for equilibrium constant for this reaction will be,
\(K_c=\frac{[CaO]\times [CO_2]}{[CaCO_3]}\)
Now put all the given values in this expression, we get :
\(K_c=\frac{0.029\times 0.085}{0.028}=0.088\)
Part A
How much heat is required to convert 4.88 g of ice at-14.0°C to water at 23.0°C? (The heat capacity of ice is 2.09 J/(g- "C). AHp (H₂O) = 40.7 kJ/mol, and AH (H₂O) = 6.02 kJ/mol.)
Express your answer with the appropriate units.
?
Answers
Taking into account the definition of calorimetry, sensible heat and latent heat, the amount of heat required is 2.243974 kJ or 2,243.974 J.
Definition of calorimetry, sensible heat and latent heatCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
-14 °C to 0°CIn firts place, you know that the melting point is 0°C. So, first of all you must increase the temperature from -14 ° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).
The amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c(solid)= heat capacity of ice= 2.09 \(\frac{J}{gC}\)m= 4.88 gΔT= Tfinal - Tinitial= 0 °C - (-14) °C= 14 °CReplacing:
Q1= 2.09 \(\frac{J}{gC}\) × 4.88 g× 14 °C
Solving:
Q1=142.7888 J= 0.1427888 kJ
Change of stateThe heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
In this case, you know:
n= 4.88 g×\(\frac{1 mole}{18 g}\) = 0.2711 moles, where 18 \(\frac{g}{mole}\) is the molar mass of H₂O, that is, the amount of mass that a substance contains in one mole.ΔHfus= 6.02 \(\frac{kJ}{mol}\)Replacing:
Q2= 0.2711 moles×6.02 \(\frac{kJ}{mol}\)
Solving:
Q2= 1.632022 kJ
0 °C to 23 °CSimilar to sensible heat previously calculated, you know:
c(liquid)= specific heat of water= 4.18\(\frac{J}{gC}\)m= 4.88 gΔT= Tfinal - Tinitial= 23 °C - 0 °C= 23 °CReplacing:
Q3= 4.18\(\frac{J}{gC}\) × 4.88 g× 23 °C
Solving:
Q3= 469.1632 J= 0.4691632 kJ
Total heat requiredThe total heat required is calculated as:
Total heat required= 0.1427888 kJ + 1.632022 kJ + 0.4691632 kJ
Total heat required= 2.243974 kJ= 2,243.974 J
In summary, the amount of heat required is 2.243974 kJ or 2,243.974 J.
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Rank the the following parts of the EMS from shortest wavelength to longest wavelength. Input your answer as a 7 digit number (ex. 7654321)
1. visible light
2. ultraviolet
3. gamma rays
4. radio waves
5. x rays
6. microwaves
7. infrared
Answers
The order of the components of the electromagnetic spectrum from shortest wavelength to longest is as follows: 3-5-2-1-7-6-4.
What is electromagnetic spectrum?Electromagnetic spectrum is the entire range of wavelengths of all known electromagnetic radiations extending from gamma rays, to X-rays through visible light, infrared, to radio waves.
The components of the electromagnetic spectrum from order of shortest to longest wavelength is as follows;
Gamma raysX-raysUV radiationVisible lightInfrared lightMicrowavesRadio wavesThis suggests that gamma rays have the shortest wavelength while radio waves have the longest wavelength.
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How many grams (of mass m ) of glucose are in 355 mL of a 5.50 % (m/v) glucose solution?
Answers
Solution = solute + solvent (generally water)
% (m/v): mass of solute diluted in 100 mL of solution
We have here 355 mL of 5.50 %(m/v) solution.
To find the mass of glucose, we proceed like this:
5.50 %(m/v): 5.50 g of glucose ----- 100 mL of solution
So,
5.50 g of glucose ------- 100 mL of solution
x -------- 355 mL of solution
x = 355 mL x 5.50 g / 100 mL
x = 19.5 g of glucose = answer
Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g. Which best describes the results of Franklin’s experiment? No error occurred, some of the products are always lost as heat. An error occurred, the mass of the reactants should equal the mass of the products. An error occurred, the products should weigh more than the reactants. No error occurred, water is not weighed when determining the weight of the products.
Answers
Answer:
B
Explanation:
took the test
Answer:
B
Explanation:
Make an argument about the following claim: Exothermic reactions only release thermal energy
Answers
Exothermic reactions only release thermal energy, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
What is an exothermic reaction ?An exothermic process is one in which energy is given off as heat or light. In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.
The most exothermic reaction is the burning of methane because it generates a significant quantity of heat.
Thus, Exothermic reactions only release thermal energy.
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Heat energy always moves in which direction?
Group of answer choices
Large objects to small objects
Dark objects to light objects
Warm objects to cool objects
Smooth objects to rough objects
Answers
Answer:
large object to small objects
Answer:
The answer is C or warm objects to cool objects
Explanation:
Heat is the thermal energy flows from one substance to another when the substances differ in temperature. When you drink hot chocolate the heat from the liquid will flow to your mouth.
List two characteristics of a calorimeter that are necessary for successful heat measurement.
Answers
Two characteristics of a calorimeter that are necessary for successful heat measurement are good thermal insulation to minimize heat loss and a temperature measurement device to accurately measure temperature changes.
How does a calorimeter work?A calorimeter works by measuring the heat exchanged between two substances in a chemical or physical process. The substances are placed in the calorimeter and allowed to reach thermal equilibrium, and the temperature change of the system is measured to calculate the amount of heat transferred.
What is the difference between a bomb calorimeter and a coffee cup calorimeter?A bomb calorimeter is designed for measuring the heat of combustion of a substance in a sealed container under constant volume conditions, while a coffee cup calorimeter is a simpler design used for measuring the heat of reaction of a substance in an open container under constant pressure conditions. The bomb calorimeter is typically more accurate but also more complex and expensive to use.
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For lunch today, I ate an apple. What type of carbohydrate did I ingest?
Answers
Answer:
Monosaccharide
Explanation:
Apples contain high levels of fructose, which is a monosaccharide.
help pls
Which process of sedimentary rock formation occurs last?
cementation
compaction
deposition
erosion
Answers
Answer:
Compaction.
Explanation:
All the others are before this.
When 7.524 is rounded to 3 sig figs it will be
Answers
When 7.524 is rounded to 3 significant figures, it will be 7.52.
The process of changing a number to a nearby number with fewer significant digits is known as rounding.
Rounding can be done to the nearest integer, the nearest tenth, the nearest hundredth, and so on.
Here are some pointers on rounding numbers to a certain number of significant digits:If the digit following the last significant digit is less than 5, simply drop it and all following digits.
(round down)For example, 2.832 rounded to two significant digits is 2.8 since the 3 is followed by a 2 which is less than 5.
If the digit following the last significant digit is greater than 5, add 1 to the last significant digit, then drop all of the digits that follow it.
(round up)For example, 4.673 rounded to two significant digits is 4.7 since the 3 is followed by a 7 which is greater than 5.
If the digit following the last significant digit is exactly 5, the preceding digit is odd, and no other digits follow, increase the last significant digit by 1.
If the digit following the last significant digit is exactly 5, the preceding digit is even, and no other digits follow, simply leave the last significant digit alone.
For example, 2.875 rounded to two significant digits is 2.9 since the 5 is followed by an odd number, which means that the 8 should be rounded up, while 2.765 rounded to two significant digits is 2.8 since the 5 is followed by an even number, which means that the 6 should be left alone.
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2H2 + O2 --> 2H2OHow many moles of hydrogen gas are needed to produce 120g of water?
Answers
6.67moles
Explanations:
Given the balanced chemical reaction between hydrogen and oxygen expressed as:
\(2H_2+O_2\rightarrow2H_2O\)First, you need to calculate the moles of water produced.
\(\begin{gathered} \text{Moles}=\frac{Mass}{\text{Molar mass}} \\ \text{Moles of water=}\frac{120}{2(1)+16} \\ \text{Moles of water}=\frac{120}{18} \\ \text{Moles of water}=6.67\text{moles} \end{gathered}\)Based on stochiometry, 2 moles of hydrogen produces 2 moles of water, hence the moles of hydrogen that will be needed to produce 120g of water is 6.67moles
How many valence electrons must a lithium atom lose to obtain a complete valence shell?
A. one
B. two
C. three
D. four
Answers
Answer:
C. three
Explanation:
Can any help me answer this pls
Answers
Refer to the attachments
Hydrogen Fluoride-1Potassium Fluoride-2Ethane-3Ethene-4
Fatty foods become rancid due to the process of
Answers
Answer:
Fatty foods become rancid due to the process of rancidity
whats the awnser? i cant find it and i need it asap! anyone i will crown you the brainleist!
Answers
Identify the nitrogen compound represented by the formula NO2.
Nitrous oxide
Nitrite
ammonia
nitrate
Answers
Answer:
Nitrite
Explanation:
Nitrous Oxide = N₂O
Nitrite = NO₂
Ammonia = NH₃
Nitrate = NO₃⁻
Select the best answer for the question.
10. What's the structure of PF,? Is it polar or non-polar?
O A. Trigonal bipyramidal, non-polar
OB. Square pyramid, polar
O C. Square pyramid, non-polar
O D. Trigonal bipyramidal, polar
Answers
Write two half‑reactions to describe each of these metal displacement reactions. Include phase symbols.
Mg(s)+CoBr2(aq)⟶MgBr2(aq)+Co(s)
oxidation half‑reaction:
reduction half‑reaction:
Cu(s)+2AuCl(aq)⟶CuCl2(aq)+2Au(s)
oxidation half‑reaction:
reduction half‑reaction:
Answers
In redox reactions, an oxidation half reaction shows the oxusetoon occurring while the reduction half reaction shows the reduction occurring in the overall reaction.
What are redox reactions?Redox reactions are reactions in which oxidation and reduction reactions occur together to the same extent.
A redox reaction can be split into two half oxidation and reduction reactions.
The half reactions of the given reactions are shown below:
Overall reaction;
\(A. Mg(s) + CoBr_2(aq) ⟶ MgBr_2(aq) + Co(s) \\ \)
Oxidation half reaction:
\(Mg (s) ---> Mg ^{2+}(aq)\)
Reduction half reaction:
\(Co^{2+} (aq) ---> Co (s)\)
B. Overall reaction
\(Cu(s) + 2AuCl(aq) ⟶ CuCl_2(aq) + 2Au(s) \\ \)
Oxidation half reaction:
\(Cu(s) ---> Cu^{2+}(aq)\)
Reduction half reaction:
\(2Au^{+}(aq) ---> 2 Au (s)\)
Therefore, redox equations can be spilt into oxidation and reduction half reactions.
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One serving of peanut butter contains 5.0 g of carbohydrate, 12 g of fat, and 6.0 g of
wprotein. How many kilocalories (kcal) does a serving of peanut butter contain?
(Round the final answer to the
tens place.)
Answers
The serving of peanut butter contains 117kcal
Calculation of calories of food Nutrients1 gram of both carbohydrate and protein contains 4 (kcal)
1 gram of fat contains 9 (kcal)
But peanut butter contains 5g of fat. The kilocalories of fat present is;
1 g = 9 kcal
5g = F
F = 5×9
F = 45 kcal
The kilocalories of carbohydrates present is;
1g = 4kcal
12g = C
C= 12×4
C = 48kcal
The kilocalories of proteins present is;
1g = 4kcal
6 g = P
P = 4× 6
P = 24 kcal
Therefore, the total kilocalories of the peanut = 45 + 48 + 24 = 117kcal
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how many calories are in a snack with 175 kj of energy
Answers
Answer:
41826.05 Calories
Explanation:
1 J = 0.239006 Calories
175 KJ
= 175 x 1000 J
= 175000 J
175000 J to Calories
= 175000 x 0.239006
= 41826.05 Calories
Answer: 41.8
Explanation:
Acellus verified ✅
the class of organic compound below contains a carbonyl group as a part of its structure?
Answers
Aldehydes and Ketones. Aldehydes and ketones are classes of organic compounds that contain a carbonyl (C=O) group.
that's the correct answer
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