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WorksheetsStoichiometry Assesment quiz
Total questions: 20
Worksheet time: 10mins
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
What is the volume at STP of 0.5 moles of N₂?
5.6 L
11.2 L
22.4 L
44.8 L
What is the molar mass of H₂O?
16 g/mol
18 g/mol
20 g/mol
22 g/mol
How many liters of CO₂ are produced at STP from the complete combustion of 1 mole of C₃H₈? (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)
11.2 L
22.4 L
33.6 L
44.8 L
Calculate the percent composition of hydrogen in H₂SO₄.
2.04%
4.08%
6.12%
8.16%
How many grams of H₂ are needed to react with 10 grams of N₂ to form NH₃? (N₂ + 3H₂ → 2NH₃)
1.0 g
2.0 g
3.0 g
4.0 g
What is the empirical formula of a compound with a molecular formula of C₆H₁₂O₆?
CH₂O
C₆H₁₂O₆
C₂H₄O₂
C₃H₆O₃
What volume of O₂ at STP is required to completely react with 2 moles of C₃H₈? (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)
11.2 L
22.4 L
44.8 L
112.0 L
What mass of CO₂ is produced from burning 2 grams of C? (C + O₂ → CO₂)
5.33 g
6.67 g
8.00 g
11.2 g
What is the molar mass of Al₂(SO₄)₃?
150 g/mol
250 g/mol
342 g/mol
480 g/mol
Which of the following has the greatest number of atoms?
1 mole of H₂O
1 mole of CO₂
1 mole of O₂
1 mole of CH₄
