Stoichiometry Assesment quiz

What is the limiting reactant when 5 grams of H₂ reacts with 32 grams of O₂ to form water?

• O₂

• N₂

• H₂

• H₂O

What is the empirical formula of a compound with 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass?

• CHO

• CH₂O

• C₂H₄O₂

• CH₃O

What is the coefficient of H₂O when the equation H₂ + O₂ → H₂O is balanced?

• 1

• 2

• 3

• 4

How many moles of NaOH are needed to neutralize 1 mole of H₂SO₄? (H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O)

• 0.5 moles

• 1 mole

• 1.5 moles

• 2 moles

If you have 0.25 moles of Na₂CO₃, how many moles of O atoms do you have?

• 0.25 moles

• 0.5 moles

• 0.75 moles

• 1.5 moles

How many moles are in 50 grams of NaCl (molar mass = 58.44 g/mol)?

• 0.5 moles

• 0.85 moles

• 1.2 moles

• 2.0 moles

How many molecules are in 2 moles of CO₂?

• 6.02 × 10²³

• 1.20 × 10²⁴

• 3.01 × 10²³

• 2.40 × 10²⁴

If 4 moles of H₂ react with 2 moles of O₂, how many moles of H₂O are formed?

• 2 moles

• 3 moles

• 4 moles

• 6 moles

Which of the following reactions is balanced?

• CH₄ + 2O₂ → CO₂ + H₂O

• C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

• 2H₂ + O₂ → 2H₂O

• N₂ + 3H₂ → 2NH₃

How many grams are in 0.5 moles of KCl (molar mass = 74.55 g/mol)?

• 37.28 g

• 74.55 g

• 111.83 g

• 149.10 g