Unit 9: Stoichiometry

Basic Stoichiometric Conversions

100

Given the balanced equation:2 N2H4(l) + N2O4(l) ----> 3 N2(g) + 4 H2O(g) The amount of moles of dinitrogen tetroxide required to produce 57 moles of nitrogen

What is 19 moles N2O4?

200

Silver and nitric acid react according to the following balanced equation: 3 Ag(s) + 4 HNO3(aq) ---> 3 AgNO3(aq) + 2 H2O(l) + NO(g) The amount of moles of silver needed to react with 40 moles of nitric acid.

What is 30 moles of Ag?

300

At a very high temperature, manganese is isolated from its ore, manganomanganic oxide, via the following balanced equation: 3 Mn3O4(s) + 8 Al(s) ---> 4 Al2O3(s) + 9 Mn(s) If 4.37 moles of aluminum are consumed, the amount of molecules of aluminum oxide produced.

What is 1.32 X 10^24 Molecules of Al2O3?

400

Calculate the mass of aluminum oxide produced when 3.75 moles of aluminum burn in oxygen.

What is 191 g Al2O3?

500

Camels store the fat tristearin (C57H110O6) in the hump. Besides being a source of energy, the fat is a source of water for the camel because when the fat is burned, the following reaction occurs: 2 C57H110O6(s) + 163 O2(g) ---> 114 CO2(g) + 110 H2O(l) The mass of tristearin required to produce 55.56 moles of water (about 1 liter of liquid water).

What is 900.0 g C57H110O6?

Volumetric Stoichiometry

100

Given the following equation, the amount of L of H2 gas produced from 3.5 g HCl at STP? Ca(s) + 2HCl(aq) ---> CaCl2(aq) + H2(g)

What is 1.1 Liters of H2?

200

___ CuO + ___ H2 ---> ___ Cu + ___ H2O At STP, the amount of liters of hydrogen needed to react with 88 g of copper (II) oxide.

What is 25 Liters H2?

300

___ CH4 + ___ O2 ---> ___ CO2 + ___ H2O The volume of methane needed to completely react with 500 liters of oxygen. Disregard Significant figures.

What is 250 Liters CH4?

400

___ Al + ___ HCl ---> ___ AlCl3 + ___ H2 The amount of liters of hydrogen (at STP) produced by reacting 3.54 x 10^24 atoms of aluminum with excess hydrochloric acid.

What is 198 Liters of H2?

500

___ (NH4)2SO4 + ___ Ca(OH)2 ---> ___ CaSO4 + ___ NH3 + ___ H2O At STP, the amount of dm^3 of ammonia produced by using 26.0 g of calcium hydroxide.

What is 15.7 dm^3 of NH3?

Advanced Stoichiometric Conversions

100

____NaCl + ____ AgNO3 ---> ____ AgCl + ____ NaNO3 78.00 grams of NaCl produce this many grams of AgCl.

What is 191.2 g AgCl?

200

____ NaOH + ____Al ---> ____ Na3AlO3 + ____ H2 The amount of grams of Na3AlO3 that can be formed from 165.0 grams of sodium hydroxide.

What is 198.0 g of Na3AlO3?

300

____Ba(OH)2 + ____H2SO4 ---> ____BaSO4 + ____ H2O The amount of grams of BaSO4 that can be formed from 196.0 grams of H2SO4. DAILY DOUBLE

What is 466.3 g BaSO4?

400

KMnO4 + H2SO4 ---> K2SO4 + Mn2O7 + H2O The amount of moles of Mn2O7 that can be formed from 196.0 g of KMnO4.

What is 0.62 Moles of Mn2O7?

500

FeCr2O7 + K2CO3 + O2 ---> Fe2O3 + K2CrO4 + CO2 The amount of liters of O2 required to produce 100.0 g of Fe2O3 at STP.

What is 7.02 Liters O2?

Limiting & Excess Reactants

100

According to the balanced chemical equation, the amount of atoms of silver that will be produced from combining 100 g of copper with 200 g of silver nitrate. Disregard Sig Figs. Cu(s) + 2 AgNO3(aq) ----> Cu(NO3)2(aq) + 2 Ag(s)

What is 7.09 X 10^23 atoms Ag?

200

At STP, the volume of “laughing gas” (dinitrogen monoxide) that will be produced from 50 g of nitrogen gas and 75 g of oxygen gas.

What is 40 Liters of N20?

300

The amount of grams of water that will be produced from 50g of hydrogen and 100 g of oxygen.

What is 112.4 grams H20?

400

An unbalanced chemical equation is given as: ___N2H4(l) + ___N2O4(l) ---> ___N2(g) + ___H2O(l). and you begin with 400 g of N2H4 and 900 g of N2O4… The mass of excess reactant left over at the conclusion of the reaction. DAILY DOUBLE

What is 325 g N2O4?

500

An unbalanced chemical equation is given as: ___Na(s) + ___O2(g) ---> ___Na2O(s) ...If you have 100 g of sodium and 60 g of oxygen… The mass of excess reactant left over at the conclusion of the reaction.

What is 25.92 g of O2?

Percent Yield

100

The equation for percent yield.

What is Actual Yield / Theoretical Yield X 100%?

200

“Slaked lime,” Ca(OH)2, is produced when water reacts with “quick lime,” CaO. If you start with 2,400 g of quick lime, add excess water, and produce 2,060 g of slaked lime, it will give this percent yield of the reaction.

What is 65%?

300

Some underwater welding is done via the thermite reaction, in which rust (Fe2O3) reacts with aluminum to produce iron and aluminum oxide (Al2O3). In one such reaction, 258 g of aluminum and excess rust produced 464 g of iron to give this percent yield of the reaction.

What is 86.9%?

400

Use the balanced equation to find out the amount of liters of sulfur dioxide that are actually produced at STP if 1.5 x 10^27 molecules of zinc sulfide are reacted with excess oxygen and the percent yield is 75%. 2 ZnS(s) + 3 O2(g) ---> 2 ZnO(s) + 2 SO2(g)

What is 4.18 X10^4 L SO2?

500

The Haber process is the conversion of nitrogen and hydrogen at high pressure into ammonia, as follows: N2(g) + 3 H2(g) ---> 2 NH3(g) If you must produce 700 g of ammonia, give the mass of nitrogen you should use in the reaction, assuming that the percent yield of this reaction is 70%. Disregard Sig figs.

What is 822.4 g of N2?