chemistry stoichiometry chap 9

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) ----> 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3 mol N2

In the reaction represented by the equation N2 + 3H2 ---> 2NH3, what is the mole ratio of hydrogen to ammonia?

3:2

For the reaction represented by the equation Mg + 2HCl → H2 + MgCl2, calculate the percentage yield of magnesium chloride if 100. g of magnesium react with excess hydrochloric acid to yield 330. g of magnesium chloride

84.23 or 84.2%

When the equation Fe3O4 + Al --> Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?

9

What is the measured amount of a product obtained from a chemical reaction?

actual yield

the coefficients in a chemical equation represent the a. masses, in grams, of all reactants and products b. relative numbers of moles of reactants and products c. number of atoms in each compound in a reaction d. number of valence electrons involved in the reaction

relative numbers of moles of reactants and products

For the reaction represented by the equation 2H2+O2-->2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 g H20

For the reaction represented by the equation 2H2 + O2 → 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108g H20

For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water?

120g

For the reaction represented by the equation SO3 + H2O ----> H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?

320g

For the reaction represented by the equation 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593g

For the reaction represented by the equation AgNO3+NaCl-->NaNO3+AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?

7 mol

For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, calculate the percentage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromin

91%

For the reaction represented by the equation SO3 + H2O → H2SO4, calculate the percentage yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid.

93.9%

each of the four types of reaction stoichiometry problems requires using a

a mole ratio

A balanced chemical equation allows one to determine the a. mole ratio of any two substances in the reaction b. energy released in the reaction c. electron configuration of all elements in the reaction d. mechanism involved in the new reaction

a. mole ratio of any two substances in the reaction

If one knows the mole ratio of a reactant and product in a chemical reaction, one can

calculate the mass of the product produced from a know mass of reactant

Which equation is NOT balanced? a) 2H2 + O2 ---> 2H2O b) 4H2 + 2O2 ---> 4H2O c) 2Al + 3F2 -->2AlF3 d) 2H2 + O2 ---> H2O

d

Which reactant controls the amount of product formed in a chemical reaction?

limiting reactant

After calculating the amount of reactant B required to completely react with A, then comparing that amount with the amount of B available, one can determine the

limiting reagent

What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?

percentage yield

a chemical equation is balanced when...

the same number of of each kind of atom appears in the reactant and the product.