Chemistry Unit Conversions Worksheet

Chemistry Unit Conversions

Read each question carefully and show all your work for calculations. Pay close attention to units and significant figures.

1. The SI unit for amount of substance is the  .

2. Avogadro's number is approximately   particles per mole.

3. Molarity is defined as   of solute per liter of solution.

1. How many grams of water are produced from the complete combustion of 16.0 g of methane (CH₄)? (Given: CH₄ + 2O₂ → CO₂ + 2H₂O)

2. If 5.0 moles of hydrogen gas (H₂) react with excess oxygen, what volume of water vapor (H₂O) is produced at STP? (Given: 2H₂ + O₂ → 2H₂O)

1. What is the molarity of a solution prepared by dissolving 15.0 g of NaOH (molar mass = 40.0 g/mol) in enough water to make 250 mL of solution?

2. How many grams of KCl are needed to prepare 1.5 L of a 0.50 M KCl solution? (Molar mass of KCl = 74.55 g/mol)

1. The ideal gas law can be used to convert between moles, volume, pressure, and temperature of a gas.

2. When converting between Celsius and Kelvin, you add 273.15 to the Celsius temperature.

A chemist needs to dilute a 2.5 M stock solution of HCl to prepare 500 mL of a 0.75 M HCl solution. Describe the steps involved in preparing this solution, including any necessary calculations. You may include a diagram of the glassware used.