Finding the Mole Ratio in Stoichiometry

Why is it important to balance chemical equations?

• To find the mass of reactants

• To measure the temperature

• To determine the mole ratio

• To identify the products

What do the coefficients in a balanced chemical equation represent?

• The color of the compounds

• The speed of the reaction

• The mole ratios between substances

• The volume of the substances

In the reaction O2 to H2O, what is the mole ratio of O2 to H2O?

• 1:1

• 1:2

• 2:2

• 2:1

If you have 0.45 moles of O2, how many moles of H2O are formed?

• 0.22 moles

• 1.35 moles

• 0.90 moles

• 0.45 moles

What is the first step in solving a problem using mole ratios?

• Estimate the answer

• Identify the products

• Balance the chemical equation

• Measure the temperature

In a 4:3:2 ratio problem, if you have 0.27 moles of oxygen, how many moles of Fe are formed?

• 0.36 moles

• 0.18 moles

• 0.72 moles

• 0.54 moles

What is the preferred method for solving mole ratio problems?

• Using a calculator

• Using a periodic table

• Using a conversion factor

• Using estimation

When balancing the equation for NH3 formation, what is the coefficient for H2?

• 3

• 1

• 2

• 4

If you have 3.8 moles of H2, how many moles of NH3 are formed?

• 2.5 moles

• 3.8 moles

• 1.9 moles

• 5.0 moles

What is the benefit of using mole ratios as conversion factors?

• It increases the reaction speed

• It alters the products

• It simplifies the calculation

• It changes the reactants