Stoichiometry

In the reaction 2RbNO₃ --> 2RbNO₂ + O₂, how many moles of O₂ are produced when 7.0 moles of RbNO₃ decompose?

• 1.0 mol

• 3.5 mol

• 4.0 mol

• 7.0 mol

(2-part question) For the equation Ca(OH)₂ + HCl --> CaCl₂ + H₂O what are the correct ratios? How many moles of water form from 4 moles of HCl?

• 1,2,1,2 and 4 mol

• 1,2,1,2 and 2 mol

• 1,1,1,1 and 4 mol

• 1,1,1,1 and 2 mol

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

• 1 : 1

• 1 : 2

• 3 : 1

• 3 : 2

From the reaction CH₄ + 4Cl₂ --> CCl₄ + 4HCl, how many grams of CCl4 are produced by reacting 650.0 g Cl2 with excess methane?

• 3.529 g

• 70.57 g

• 352.9 g

• 7057 g

An experiment involving Ca(CO₃) + 2HCl --> H₂O + CO₂ + CaCl₂ yields 90 g of CO₂. What is the percent yield if 150 g of HCl was used?

• 87.6%

• 96.3%

• 98.2%

• 100%

A student burns 1.50 mol C₃H₈ following the reaction

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O

How many grams of CO₂ are produced?

• 44.0 g

• 66.1 g

• 132 g

• 198 g

For the balanced equation

3CaCl₂ + 2Na₃(PO₄) --> Ca₃(PO₄)₂ + 6NaCl

when you added 163.9 g of Na₃(PO₄) you produced 116 g Ca₃(PO₄)₂. What was the percent yield?

• 141%

• 74.8%

• 70.8%

• 50.0%

In the reaction

4NH₃ + 5O₂ --> 4NO + 6H₂O,

what is the limiting reactant?

• NH₃

• O₂

• NO

• H₂O

If equal moles of each reactant in the equation

CaF₂ + Br₂ --> CaBr₂ + F₂

what would be the limiting reactant?

• F₂

• CaBr₂

• Br₂

• There is no limiting reactant

For the model chemical reaction shown here, which substance is the limiting reagent in the chemical reaction?

• Substance A

• Substance B

• Substance C

• Substance D