Stoichiometry IB Test Questions

What is the percentage yield when 7 g of ethene produces 6 g of ethanol?

Mr(ethene) = 28 and Mr(ethanol) = 46

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Tags

NGSS.HS-PS1-7

What is the volume, in cm³, of the final solution if 100 cm³ of a solution containing 1.42 g of sodium sulfate, Na₂SO₄, is diluted to the concentration of 0.020 mol dm–3?

Mr(Na₂SO₄) = 142

• 50

• 400

• 500

• 600

What will be the concentration of sulfate ions in mol dm^-3 when 0.20 mol of KAl(SO₄)₂ is dissolved in water to give 100 cm³ of aqueous solution?

• 0.2

• 1.0

• 2.0

• 4.0

Tags

NGSS.HS-PS1-7

What mass of carbon dioxide, in g, is produced by the reduction of 80 g of iron (III) oxide?

• 44

• 66

• 88

• 132

Tags

NGSS.HS-PS1-7

When 50 cm³ of a hydrocarbon C_xH_Y was burned in excess oxygen, 200cm³ of carbon dioxide and 250 cm³ were produced. What is the molecular formula of the hydrocarbon?

• C₂H₄

• C₃H₈

• C₄H₈

• C₄H₁₀

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What volume of sulfur trioxide, in cm³ can be prepared using 40 cm³ sulfur dioxide and 20 cm³ oxygen gas by the following reaction?

• 20

• 40

• 60

• 80

Tags

NGSS.HS-PS1-7

100.0 cm³ of a 0.50 mol dm^-3 solution of BaCl₂ is added to 50.0 cm³ of a 0.10 mol dm^-3 solution of Na₂SO₄. A precipitate of BaSO₄ is formed according to the equation above. What is the amount, in mol, of BaSO₄ produced?

• 0.0050

• 0.010

• 0.050

• 0.10

Tags

NGSS.HS-PS1-7

5.0 mol of Fe₂O₃ and 5.0 mol of CO (g) react according to the equation above. What is the limiting reactant and how many moles of the excess reactant remain unreacted?

• LR: CO // ER remaining = 2.0 mol

• LR: CO // ER remaining = 3.0 mol

• LR: Fe₂O₃ // ER remaining = 1.0 mol

• LR: Fe₂O₃ // ER remaining = 2.0 mol

Tags

NGSS.HS-PS1-7

The complete combustion of 15.0cm³ of a gaseous hydrocarbon X produces 60.0 cm³ of carbon dioxide gas and 75.0 cm³ of water vapour. What is the molecular formula of X? (All volumes are measured at the same temperature and pressure.)

• C₄H₆

• C₄H₈

• C₄H₁₀

• C₆H₁₀

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the maximum volume, in dm³, of CO₂ produced when 1.00 g of CaCO₃ (s) reacts with 20.0 cm³ of 2.00 mol dm^-3 HCl (aq)?

Molar volume of a gas = 22.7 dm³ mol^-1; Mr CaCO₃ = 100.0

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Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4