Ammonia can be formed by a direct reaction of nitrogen and hydrogen. N2(g) + 3 H2(g) 2 NH3(g) A tiny portion of the starting mixture is represented by the diagram, where the blue circles represent N and the white circles represent H. Which of these represents the product mixture? For the reaction of the given sample, which of these statements is true? (a) N2 is the limiting reactant. (b) H2 is the limiting reactant. (c) NH, is the limiting reactant. (d) No reactant is limiting: they are present in the correct stoichiometric ratio.

Aluminum reacts with Cl2 to form AlCl3. If you have 0.40 mol of Al, what amount (moles) of Cl2 is needed for a complete reaction? (a) 0.40 motes Cl2 (b) 0.60 moles Cl2 (c) moles Cl2 (d) 1.2 moles Cl2

The reaction of methane and water is one way to prepare hydrogen for use as a fuel: CH4(g) + H2O(g) CO(g) + 3 H2(g) If you begin with 995 g of CH4 and 2510 g of water, (a) Which reactant is the limiting reactant? (b) What is the maximum mass of H2 that can be prepared? (c) What mass of the excess reactant remains when the reaction is completed?

Aqueous solutions of iron(II) chloride and sodium sulfide react to form iron(II)sulfide and sodium chloride. (a) Write the balanced equation for the reaction. (b) If you combine 40. g each of Na2S and FeCl2, what is the limiting reactant? (c) What mass of FeS is produced? (d) What mass of Na2S or FeCl2 remains after the reaction? (e) What mass of FeCl2 is required to react completely with 40. g of Na2S?

4.14 The combustion of liquid chloroethylene, C2H3Cl, yields carbon dioxide, steam, and hydrogen chloride gas. (a) Write a balanced equation for the reaction. (b) How many moles of oxygen are required to react with 35.00 g of chloroethylene? (c) If 125.00 g of chloroethylene reacts with an excess of oxygen, how many grams of each product are formed?

4.8 In an experiment carried out at very low pressure, 13x1015 molecules of H2 are reacted with acetylene, C2H2, to form ethane, C2H6, on the surface of a catalyst. Write a balanced chemical equation for this reaction. How many molecules of acetylene are consumed?

The catalytic converter that is standard equipment on American automobiles converts carbon monoxide (CO)to carbon dioxide (CO2) by the reaction 2CO + O2 2CO2 What mass of O2, in grams, is needed to react completely with 25.0 g of CO?

4.29 When Al(OH)3 reacts with sulfuric acid, the following reaction occurs: 2Al(OH)3+3H2SO4Al2( SO4)3+6H2O If 1.7103 g of Al(OH)3 is combined with 680 g of H2SO4, how much aluminum sulfate can form?

Hydrogen cyanide, HCN, can be made by a two-step process. First, ammonia is reacted with O2 to give nitric oxide, NO. 4NH3(g)+5O2(g)4NO(g)+6H2O(g) Then nitric oxide is reacted with methane, CH4. 2NO(g)+2CH4(g)2HCN(g)+2H2O(g)+H2(g) When 24.2 g of ammonia and 25.1 g of methane are used, how many grams of hydrogen cyanide can be produced?