Quiz on Moles and Stoichiometry

What is the number of moles in 22 grams of carbon dioxide (CO₂)? (Molar mass of CO₂ = 44 g/mol)

• 0.25 moles

• 0.5 moles

• 1 mole

• 2 moles

How many molecules are there in 2 moles of water (H₂O)?

• 6.022 x 10²³ molecules

• 1.204 x 10²⁴ molecules

• 3.011 x 10²³ molecules

• 1.806 x 10²⁴ molecules

If 4 moles of hydrogen gas (H₂) react with excess oxygen gas (O₂) to form water, how many moles of water are produced?

• 2 moles

• 4 moles

• 6 moles

• 8 moles

What is the mass of 0.75 moles of sodium chloride (NaCl)? (Molar mass of NaCl = 58.5 g/mol)

• 29.25 grams

• 43.875 grams

• 58.5 grams

• 87.75 grams

In the reaction 2 H₂ + O₂ --> 2H₂O, how many grams of water are produced from 4 grams of hydrogen gas? (Molar mass of H₂ = 2 g/mol, Molar mass of H₂O = 18 g/mol)

• 18 grams

• 36 grams

• 72 grams

• 144 grams