Stoichiometry Review

Which equation is not balanced? 2H2 + O2  2H2O 4H2 + 2O2  4H2O H2 + H2 + O2  H2O + H2O 2H2 + O2 + H2O

Which coefficients correctly balance the equation NH4NO2  N2 + H2O 1,2,2 1,1,2 2,1,1 2,2,2

When the equation Fe3O4 + Al  Al2O3 + Fe is correctly balanced, the coefficient of Fe is 7 9

The units of molar mass are g/mol mol/g amu/mol amu/g

In the reaction represented by the equation N2 + 3H2  2NH3, what is the mole ratio of nitrogen to ammonia? 1:1 1:2 1:3 2:3

In the reaction represented by the equation 2Al2O3  4Al + 3O2, what is the mole ratio of aluminum to oxygen? 10:6 3:4 2:3 4:3

In the reaction represented by the equation C + 2H2  CH4, what is the mole ratio of hydrogen to methane? 1:1 2:1 1:2 2:4

According to the Haber process equation, N2 + 3H2  2NH3, how many moles of nitrogen gas are required to completely convert 9.0 mol hydrogen gas to ammonia? 1.0mol 2.0mol 3.0mol 6.0mol

In the equation 2KClO3  2KCl + 3O2, how many moles of oxygen are produced when 3.0mol KClO3 completely decompose? 1.0mol 2.5mol 3.0mol 4.5mol

1 mole of oxygen has 6.022 x 1022 atoms 6.022 x 1023 atoms

What is the molar mass of magnesium sulfate? The sulfate ion is SO42-. 72 g/mol 120 g/mol 240 g/mol 140 g/mol

Calculate the mass in grams of 0.0091 moles of Sr(NO3)2.

Calculate the mass in grams of 9.96 x 1026 atoms of iron.

Calculate the percent composition of Al(OH)3.

What is the empirical formula of a compound with 24. 3% Fe, 33 What is the empirical formula of a compound with 24.3% Fe, 33.9% Cr, and 41.8% O? FeCrO FeCrO5 Fe2Cr3O12 FeCr3O6

What is the empirical formula of a compound with 41. 39% C, 3 What is the empirical formula of a compound with 41.39% C, 3.47% H, and the remainder O? CHO C2H3O C7HO C6H12O6

What is the molecular formula of a compound with an empirical formula of CHO and a molecular mass of 116.7 amu? CHO C4H4O4 C4H4O C2H4O2

Phosphorus burns in air to produce a phosphorus oxide in the following reaction: 4P + 5O2  P4O10 What mass of phosphorus will be needed to produce 3.25 moles of P4O10? 0.104 g 0.026 g 403 g 25 g

What mass of aluminum will react with 150 What mass of aluminum will react with 150. g of iron(III) oxide to produce iron and aluminum oxide according to the equation below: 2Al + Fe2O3  2Fe + Al2O3 50.6 g 8100 g 25.3 g 12.7 g

If 3. 00 g of nitrogen reacts with 3 If 3.00 g of nitrogen reacts with 3.00 g of hydrogen, what mass of ammonia is produced for the reaction: N2 + 3H2  2NH3 34.0 g 7.3 g 3.6 g 6.0 g

For the reaction represented by the equation 2Na + H2O  2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0mol of sodium with an excess of water? 40.g 80.g 120.g 240.g

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 10.8 mol 12.5 mol 25.0 mol

A chemical reaction involving substances A and B stops when B is completely used. Substance B is the excess reactant limiting reactant primary reactant primary product

When the limiting reactant in a chemical reaction is completely used, the excess reactants begin combining reaction slows down reaction speeds up reaction stops

What is the maximum possible amount of product obtained in a chemical reaction? theoretical yield percentage yield mole ratio actual yield

For the reaction SO3 + H2O  H2SO4, calculate the percentage yield if 500.g of sulfur trioxide reacts with excess water to produce 575g of sulfuric acid in lab. 82.7% 88.3% 91.2% 93.9%

For the reaction Mg + 2HCl  MgCl2 + H2, calculate the percentage yield of magnesium chloride if 100.g of magnesium react with excess hydrogen chloride to yield 330.g of magnesium chloride in lab. 71.8% 74.3% 81.6% 84.2%

The molar mass of LiF is 25. 94g/mol The molar mass of LiF is 25.94g/mol. How many moles of LiF are present in 10.37g? 0.3998mol 1.333mol 2.500mol 36.32mol

How many molecules are there in 5.0g CH3OH? 9.4 x 1022 3.0 x 1024 3.6 x 1024 3.8 x 1024

What is the mass percentage of chlorine in NaCl? 35.45% 50% 60.7% 64.5%

The molecular formula for vitamin C is C6H8O6 The molecular formula for vitamin C is C6H8O6. What is the empirical formula? CHO CH2O C3H4O3 C2H4O2

A compound’s empirical formula is N2O5 A compound’s empirical formula is N2O5. If the formula mass is 108amu, what is the molecular formula? N2O5 N4O10 NO3 N2O4x