Limiting reactants & Percent yield

Zn + 2HCl <=> ZnCl₂ + H₂

65g of Zinc reacts with 79g of Hydrochloric Acid to produce Zinc Chloride and Hydrogen gas. What is the limiting reactant?

• Hydrogen gas

• Hydrochloric Acid

• Zinc chloride

• Zinc

Tags

NGSS.HS-PS1-7

Na₂CO₃ + 2HCl <=> 2NaCl + CO₂ + H₂O

87g of Sodium bicarbonate (Na₂CO₃) reacts with 120g of hydrochloric acid (HCl) to produce sodium chloride, carbon dioxide and water. What is the limiting reactant?

• Sodium bicarbonate

• Hydrochloric acid

• Water

• Sodium chloride

Tags

NGSS.HS-PS1-7

SiCl₄ + 4H₂O <=> H₄SiO₄ + 4HCl

40g of Silicon Tetrachloride (SiCl₄) reacts with 22g of Water to produce Silicic Acid and Hydrochloric Acid (HCl). What is the excessive reactant?

• Water

• Hydrochloric Acid

• Silicic Acid

• Silicon Tetrachloride

Tags

NGSS.HS-PS1-7

2C₇H₆O₂ + 15O₂ <=> 14CO₂ + 6H₂O

23.0g of oxygen gas reacts with 42.0g of benzoic acid (C₇H₆O₂) to produce carbon dioxide and water. What is the limiting reactant?

• Carbon dioxide

• Oxygen gas

• Benzoic acid

• Water

Tags

NGSS.HS-PS1-7

4Si₂H₃ + 11O₂ <=> 8SiO₂ + 6H₂O

30g of Disilicon Trihydride (Si₂H₃) reacts with 50g Oxygen gas to produce Silicon Dioxide (SiO₂) and water. What is the excessive reactant?

• Water

• Disilicon Trihydride

• Silicon Dioxide

• Oxygen gas

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the equation to calculate percent yield?

• (Actual yield / Theoretical yield) x 100% = Percent yield

• (Theoretical yield / Actual yield) x 100% = Percent yield

• Mass (1 Mole / Molar mass) x 100% = Percent yield

• Mass x Speed x 100% = Percent yield

Tags

NGSS.HS-PS1-7

Na₂CO₃ + 2HCl <=> 2NaCl + CO₂ + H₂O

Billy performed the preceding chemical reaction using 76g of Na₂CO₃ and produced 48g of NaCl. This did not match his theoretical yield. What was Billy's percent yield?

• 50%

• 22%

• 48%

• 57%

Tags

NGSS.HS-PS1-7

Zn + 2HCl <=> ZnCl₂ + H₂

Billi performs the preceding reaction using 50g of Zinc and produced 10g of Zinc chloride. What is Billi's percent yield?

• 42%

• 36%

• 24%

• 30%

Tags

NGSS.HS-PS1-7

2C₇H₆O₂ + 15O₂ <=> 14CO₂ + 6H₂O

Philly reacted 120g of Benzoic acid with a surplus of Oxygen gas. If the reaction produced 60g of Carbon dioxide what was Philly's percent yield?

• 20%

• 50%

• 45%

• 78%

Tags

NGSS.HS-PS1-7

SiCl₄ + 4H₂O <=> H₄SiO₄ + 4HCl

Molly reacted 40g of Silicon Tetrachloride (SiCl₄) with a surplus of Water to produce Silicic Acid (H₄SiO₄). Molly collected 60g of Silicic Acid, what was her percent yield?

• 180%

• 150%

• 256%

• 300%

Tags

NGSS.HS-PS1-7