Stoichiometry Quiz - Requires Periodic Table and Calculator

A chemical process used to produce ethanol as a fuel additive was expected to produce 5,000 kilograms of ethanol based on the amounts of starting materials used, but only 4,760 kilograms were produced. What was the percent yield for ethanol in this process?

• 1.09%

• 4.80%

• 95.2%

• 105%

How many grams of sodium metal are required to produce 8.42 moles of hydrogen gas in the provided reaction? Assume 100% yield. 2 Na + 2 H2O --> 2 NaOH + H2

• 115.2 g Na

• 95.8 g Na

• 80.0 g Na

• 65.0 g Na

What is the mass of sodium chloride that would be produced from 1.38 moles of magnesium chloride in the provided reaction? Assume 100% yield. 2 Na + MgCl2 --> 2 NaCl + Mg

• 175.4 g NaCl

• 161.3 g NaCl

• 145.1 g NaCl

• 130.2 g NaCl

What is the limiting reagent for the provided reaction when it begins with 2.4 moles of Mg and 3.2 moles of HCl and ends with 1.6 moles of MgCl2 and 1.6 moles of H2? Mg + 2 HCl --> MgCl2 + H2

• Mg

• HCl

• MgCl2

• H2

In living cells, glucose (C6H12O6) is broken down to make energy with the following reaction: C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O How many moles of glucose could be broken down with 0.36 moles of oxygen?

• 0.060 mol O2

• 0.19 mol O2

• 0.36 mol O2

• 2.20 mol O2

Calculate the mass (in grams) of LiOH that would be needed to produce 8.03 moles of Li2SO4 in the provided reaction. 2 LiOH + H2SO4 --> Li2SO4 + 2 H2O

• 205 g LiOH

• 192 g LiOH

• 180 g LiOH

• 166 g LiOH

The provided balanced equation applies to the reaction that takes place between zinc metal and copper(I) nitrate. Zn + 2 CuNO3 --> Zn(NO32) + 2 Cu If the reaction begins with 0.037 moles of zinc and 0.11 moles of copper(I) nitrate, how many grams of copper metal can be produced? Assume 100% yield.

• 4.7 g Cu

• 15 g Cu

• 23 g Cu

• 31 g Cu

A reaction takes place in a chemistry laboratory in which silver nitrate reacts with copper to produce silver metal and copper (I) nitrate: AgNO3 + Cu --> CuNO3 + Ag How many moles of silver metal can be produced with excess of silver nitrate and 0.89 grams of copper metal? Assume 100% yield.

• 0.22 mole Ag

• 0.014 mole Ag

• 1.9 mole Ag

• 39 mole Ag

An experiment following the equation below is completed. The results are recorded in the table. NaHCO3 + HCl --> NaCl + H2O + CO2 What was the percent yield for the carbon dioxide in this experiment?

• 28%

• 54%

• 63%

• 76%