Chemical Reactions and Moles

This video tutorial covers the concept of mole ratios and conversion factors in stoichiometric calculations. It explains how to use these concepts to solve various chemical reaction problems, including the combustion of methanol, production of ammonia, and decomposition of potassium chlorate. The video also demonstrates calculations for determining the mass of reactants and products, such as iron from iron ore and oxygen for space shuttle fuel.

What is a mole ratio in a chemical reaction?

• The ratio of the energy of reactants to products

• The ratio of the volume of reactants to products

• The ratio of the number of moles of reactants to products

• The ratio of the mass of reactants to products

In the combustion of propane, how many moles of oxygen react with one mole of propane?

• Three moles

• Five moles

• Two moles

• Four moles

If 3.5 moles of methanol are burned, how many moles of oxygen are used?

• 5.25 moles

• 6.0 moles

• 4.5 moles

• 7.0 moles

How many moles of water are produced from 3.5 moles of methanol?

• 7 moles

• 5 moles

• 6 moles

• 8 moles

To produce 5 moles of ammonia, how many moles of nitrogen are required?

• 1.5 moles

• 2.5 moles

• 4.5 moles

• 3.5 moles

How many moles of hydrogen are needed to produce 5 moles of ammonia?

• 8.5 moles

• 7.5 moles

• 6.5 moles

• 5.5 moles

What is the molar mass of iron ore (Fe2O3)?

• 120 grams per mole

• 180 grams per mole

• 140 grams per mole

• 160 grams per mole

How many grams of iron are produced from 425 grams of iron ore?

• 400 grams

• 450 grams

• 350 grams

• 297 grams

What is the mass of liquid oxygen required to burn 1.02 x 10^5 kg of hydrogen?

• 9.09 x 10^5 kg

• 8.09 x 10^5 kg

• 7.09 x 10^5 kg

• 6.09 x 10^5 kg

How many molecules of oxygen are produced from the decomposition of 498 grams of potassium chlorate?

• 3.61 x 10^24 molecules

• 4.61 x 10^24 molecules

• 5.61 x 10^24 molecules

• 6.61 x 10^24 molecules