Stoichiometry Molar Mass

Using the balanced chemical equation:

Mg + 2 HCl --> MgCl₂ + H₂

How many grams of MgCl₂ is produced if 4.67 moles of HCl react?

• 219 g MgCl₂

• 4.67 g MgCl₂

• 94 g MgCl₂

• 1 mole MgCl₂

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NGSS.HS-PS1-7

Using the balanced chemical equation:

4NH₃ + 3O₂ --> 2N₂ + 6H₂O

Determine the amount of grams of N₂ is produced if 4.03 moles of NH₃ react?

• 28.0 g N₂

• 56.4 g N₂

• 2.02 g N₂

• 2 moles of N₂

Tags

NGSS.HS-PS1-7

Using the balanced chemical equation:

2C₄H₁₀ + 13O₂ --> 10H₂O + 8CO₂

Calculate the number of grams of C₄H₁₀ needed to produce 5.12 moles of CO₂.

• 58.0 g C₄H₁₀

• 2.56 g C₄H₁₀

• 74.2 g C₄H₁₀

• 2 g of C₄H₁₀

Using the balanced chemical equation:

2 Cu + O₂ --> 2 CuO

Determine the number of grams of O₂ needed to produce 0.7684 moles of CuO.

• 32.00 g O₂

• 0.3842 g O₂

• 12.29 g O₂

• 64 g of O₂

Tags

NGSS.HS-PS1-7

Calculate the molar mass of propane (C₃H₈).

• 13 g C₃H₈ per 1 mole of C₃H₈

• 1 mole of C₃H₈ is 44 g

• 99 g/mol

• 22 g per 1 mole of C₃H₈

Tags

NGSS.HS-PS1-7

Calculate the molar mass of ammonium sulfate - (NH₄)₂SO₄

• 132 g/mol

• 130 g/mol

• 34 g/mol

• 64 g/mol

Using the balanced equation:

2 HBr + Ca(OH)₂ --> H₂O + CaBr₂

What is the mole ratio between H₂O and HBr?

• 1 mol H₂O / 2 mol HBr

• 2 mol H₂O / 1 mol HBr

• 1 mol H₂O / 1 mol HBr

• 2 mol H₂O / 2 mol HBr

Tags

NGSS.HS-PS1-7

Using the balanced chemical equation:

Al₂(SO₄)₃ + 3 BaCl₂ --> 2 AlCl₃ + 3 BaSO₄

What is the mole ratio between aluminum sulfate and aluminum chloride?

• 1 mol Al₂(SO₄)₃ / 2 mol AlCl₃

• 3 mol Al₂(SO₄)₃ / 2 mol AlCl₃

• 2 mol Al₂(SO₄)₃ / 1 mol AlCl₃

• 2 mol Al₂(SO₄)₃ / 2 mol AlCl₃

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂

• 3.86 mol of O₂

• 124 g O₂

• 36.1 g of O₂

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.27 g
• 2.6 g
• 690 g
• 45 g

Tags

NGSS.HS-PS1-7