Chemistry Chapter 9 Test
For the reaction represented by the equation 2H2 + O2 → 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
108 grams
For the reaction represented by the equation 2Fe + O2 → 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?
575 grams
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?
593 grams
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?
7.0 mol
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 known mass of reactant.
The units of molar mass are
g/mole
Ozone, O3, is produced by the reaction represented by the following equation: NO2(g)+O2(g) → NO(g)+O3(g) What mass of ozone will form from the reaction of 2.0 g of NO2 in a car's exhaust and excess oxygen?
2.1 g O3
In the equation 2KClO3 → 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?
4.5 mol
In the reaction represented by the equation 2Al2O3 → 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
4:3
Whats the first step of an question?
Balance
Each of the four types of reaction stoichiometry problems requires using a
mole ratio.
For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?
0.904 mol
For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?
1.00 mol
For the reaction represented by the equation 2H2 + O2 → 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?
12 mol
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?
120 grams
In the reaction represented by the equation N2 + 3H2 → 2NH3, what is the mole ratio of nitrogen to ammonia?
1:2
Molar mass of 2Al2(So4)3
2(26)+3(32)+12(16)= 340
For the reaction represented by the equation 3Fe + 4H2O → Fe3O4 + 4H2, how many moles of iron(III) oxide are produced from 500. g of iron in an excess of H2O?
2.98 mol
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?
3.0 mol
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?
320 grams
For the reaction represented by the equation 2KClO3 → 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250. g of oxygen?
5.23 mol
For the reaction represented by the equation CH4 + 2O2 → CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane?
6.23 mol
For the reaction represented by the equation 2Na + Cl2 → 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?
70.9 grams
For the reaction represented by the equation N2 + 3H2 → 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?
9.0 mol
chemical equations:
Mole A/ Mole B. 1 mole A/amount of grams A
To balance a chemical equation, it may be necessary to adjust the
coefficients.
Moles of given yo mass of unknown
mole given x mole unknown /mole given x molar mass unknown/ 1 mole unknown = mass unknown
If one knows the mass and molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the
mole ratio of D to A from the chemical equation.
A balanced chemical equation allows one to determine the
mole ratio of any two substances in the reaction.
In the chemical reaction represented by the equation wA + xB → yC + zD, a comparison of the number of moles of A to the number of moles of C would be a[n]
mole ratio.
For the reaction represented by the equation C + 2H2 → CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
20 mol
In the reaction represented by the equation C + 2H2 → CH4, what is the mole ratio of hydrogen to methane?
2:1
In the reaction represented by the equation N2 + 3H2 → 2NH3, what is the mole ratio of hydrogen to ammonia?
3:2
mass of given to mass of unknown
mass given x 1 mole given/ molar mass given x mole unknown/ mole given x molar mass of unknown/ 1 mole unknown = mass unknown
mass of given to mole of unknown
mass given x 1 mole given/ molar mass given x mole unknown/mole given = mole unknown
molar mass=
mass of one mole
The coefficients in a chemical equation represent the
relative numbers of moles of reactants and products.
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products.
Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
stoichiometry
In the chemical equation wA + xB → yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
the mass of any of the reactants or products.
Moles of given to moles of unknown
Mole given x mole unknown/mole given = mole unknown
