Topic 3 - Quantitative Chemistry

What is a mole ratio?

• An animal that burrows underground.

• How many moles of reactant are used up in a chemical reaction.

• The ratio of a reactant / product to a different one - compared by the number of particles.

• The process by which we multiply fractions by using numbers from a chemistry problem.

Tags

NGSS.HS-PS1-7

Where are the numbers for a mole ratio found?

• They are part of the chemical formulas for the reactants / products.

• They are given in the problem.

• They are found on the periodic table for those elements.

• They are found as coefficients in the reaction's balanced chemical equation.

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

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Tags

NGSS.HS-PS1-7

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

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Tags

NGSS.HS-PS1-7

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

• 4 mol H₂O

• 6 mol H₂O

• 24 mol H₂O

• 96 mol H₂O

• 384 mol H₂O

Tags

NGSS.HS-PS1-7

What is the relative molar mass (Mr) of NaOH?

• 368 g/mole

• 40 g/mole

• 57 g/mole

• 23 g/mole

What is the mass of one mole of (NH₄)₂CO₃?

• 144g
• 138g
• 96g
• 74g

36.0 g of Be contains how many moles?

• 0.25 mol
• 4.0 mol
• 45 mol
• 320 mol

4.0 moles of H₂O would have what mass?

• 72 g
• 23 g
• 68 g
• 4.5 g

Tags

NGSS.HS-PS1-7

How many molecules are in 1 mole?

• 1

• 12

• 6.02 x 10²³

• 6.23 x 10⁶