代写1.2.7 Practice: Stoichiometry代写数据结构语言程序

1.2.7 Practice: Stoichiometry

Practice AP Chemistry

You wil l need to use a calculator and a periodic table to complete this activity.

1. NASA used canisters filled with lithium hydroxide to remove carbon dioxide inside the space shuttles. The chemical equation for the reaction is:

a. Determine the theoretical mass of lithium hydroxide required for each 5.00 g of carbon dioxide removed from the shuttle. (4 points)

b. Theoretically, what mass of lithium carbonate, Li2CO3, would be produced for each 5.00 g of carbon dioxide removed from the shuttle? (3 points)

2. One of the results of acid rain is the reaction of sulfuric acid, H2SO4, with calcium carbonate, CaCO3, to produce calcium sulfate, CaSO4, and carbonic acid, H2CO3. The chemical equation for this reaction is:

A student demonstrates the reaction by mixing 25.00 g of H2SO4with 25.00 g of CaCO3.

a. How many moles of each reactant does the student mix? (4 points)

b. Identify the limiting reactant. Explain how you know this. (2 points)

c. Calculate the theoretical mass of the excess reactant. (3 points)

d. Soon after mixing the reactants, the student determines that 33.17 g of CaSO4 was produced by the reaction. Is this a reasonable result? Show calculations to defend your answer. (4 points)

3. A researcher placed 25.0 g of silver chloride, AgCl, in sunlight and allowed the substance to decompose completely to form. silver, Ag, with the release of chlorine gas, Cl2. The gas was collected in a container during the decomposition. The researcher determined that the mass of the silver formed was 18.8 g, and the mass of the chlorine gas formed was 6.2 g. The equation for the reaction is:

a. State the law of defi nite proportions. Then use the researcher's data to confi rm the law of defi nite proportions. Show your calculations. (3 points)

b. State the law of conservation of matter. Then use the researcher's data to confi rm the conservation of matter. Show your calculations. (2 points)