SRD PAGESSS

reaction between hydrazine, N2H,, and dinitrogen tetroxide, N204, has been used to launch rockets into space. The reaction produces nitrogen gas and water vapor.
a. Write a balanced chemical equation for this reaction.
b. What is the mole ratio of N.,04 to N2?
C. How many moles of N2 will be produced if 20 000 mol of N2H, are used by a rocket? d. How many grams of H20 are made when 450. kg of N204 are consumed? jjj2. Joseph Priestley is credited with the discovery of oxygen. He produced O., by heating mercurv(II) oxide, HgO, to decompose it into its elements. How many moles of oxygen could Priestley have produced if he had decomposed 517.84 g of mercury oxide?
0. Iron(III) chloride, FeCl3, can be made by the reaction of iron with chlorine gas. How much iron, in grams, will be needed to completely react with 58.0 g of Cl2?
194. Sodium sulfide and cadmium nitrate undergo a double-displacement reaction as shown by the following equation:
Na2S + Cd(N03)2 —* 2NaN03 + CdS What is the mass, in milligrams, of cadmium sulfide that can be made from 5.00 mg of sodium sulfide?
195. Potassium permanganate and glycerin react explosively according to the following equation:
14KMnO,, + 4C3H5(OH)3 —♦
7K.2C03 + 7Mn203 + 5C02 + 16H20
a. How many moles of carbon dioxide can be produced from 4.44 mol of KMn04?
b. If 5.21 g of H.,0 are produced, how many moles of glycerin, C3Hr>(OH)3, were used?
C, If 3.39 mol of potassium carbonate are made, how many grams of manganese(Ill) oxide are also made? d. How many grams of glycerin will be needed to react with 50.0 g of KMn04? How many grams of C02 will be produced in the same reaction?
196. Calcium carbonate found in limestone and marble reacts with hydrochloric acid to form calcium chloride, carbon dioxide, and water according to the following equation: CaC03(s) + 2HC1 {aq) —♦
CaCl2(a<jf) + C02(g) + H20(/)
a. What mass of HCI will be needed to produce 5.00 x 101 kg of CaCl2?
b. What mass of C02 could be produced from the reaction of 750 g of CaC03?
197. The fuel used to power the booster rockets on the space shuttle is a mixture of aluminum metal and ammonium perchlorate. The following balanced equation represents the reaction of these two ingredients:
3Al(s) + 3NH4C104(s) —
AJ203(s) + AJCl3(g) + 3NO(g) + 6H20(g)
a. If 1.50 x 105 g of AI react, what mass of NH4C104, in grams, is required?
b. If aluminum reacts with 620 kg of NH4CI04, what mass of nitrogen monoxide is produced?
198. Phosphoric acid is typically produced by the action of sulfuric acid on rock that has a high content of calcium phosphate according to the following equation:
3H2S()4 + Ca3(P04)2 + 611,0 —.
3|CaS04«2H20l + 2H3P04
a. If 2.50 x 105 kg of H2S04 react, how many moles of H3P04 can be made?
b. What mass of calcium sulfate dihydrate is produced by the reaction of 400. kg of calcium phosphate?
c. If the rock being used contains 78.8% Ca3(P04)2, how many metric tons of H ,PQ4 can be produced from
68 metric tons of rock?
199. Rusting of iron occurs in the presence of moisture according to the following equation:
4Fe(s) + 302(g) — 2Fe203(s)
Suppose that 3.19% of a heap of steel scrap with a mass of 1650 kg rusts in a year. What mass will the heap have after one year of rusting?
Limiting Reactants: Chap. 9, Sec. 3
200. Aluminum oxidizes according to the following equation:
2A1203
Powdered Al (0.048 mol) is placed into a container containing 0.030 mol 02. What is the limiting reactant?
201. A process by which zirconium metal can he produced from the mineral zirconium!IV) orthosilicate, ZrSi04, starts by reacting it with chlorine gas to form zirconium(lV) chloride:
ZrSi04 + 2C12 —♦ ZrCl4 + Si09 + 02 What mass of ZrCl4 can be produced if 862 g of ZrSi04 and 950. g of Cl., are available? You must first determine the limiting reactant.
MIXED REVIEW
202. Heating zinc sulfide in the presence of oxygen yields the following:
ZnS + 02 —* ZnO + S02 If 1.72 mol of ZnS is heated in the presence of 3.04 mol of 02, which reactant will be used up? Balance the equation first.
203. Use the following equation for the oxidation of aluminum in the following problems:
4A1 + 302 —> 2A1203
a. Which reactant is limiting if 0.32 mol Al and 0.26 n O., are available?
b. How many moles of Al.,0 i are formed from the reac of 6.38 x 10~:< mol of O., and 9.15 x 10" * mol of Al?
C. If 3.17 g of Al and 2.55 g of 02 are available, which reactant is limiting?