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AP Exams AP Chemistry Chemical Reactions Easy Practice Question

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Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question 6 Multiple Choice Question

Question

For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

Explanation

Correct Answer: B

ANSWER

Correct Answer: B

Method / Topic: Chemical Reactions

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

Detailed Explanation

Question

For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

ANSWER

Correct Answer: B

Method / Topic: Chemical Reactions

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

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Question 6

Easy Marks: 1.0 Practice Question

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View Plans

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question

For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

Explanation

Correct Answer: B

ANSWER

Correct Answer: B

Method / Topic: Chemical Reactions

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

Detailed Explanation

Question

For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

ANSWER

Correct Answer: B

Method / Topic: Chemical Reactions

The mole ratio H2:H2O is 1:1, so 2.00 mol H2 forms 2.00 mol H2O, or 36.0 g.

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Balance atoms and charge first then apply mole ratios solubility rules or electron transfer as required.

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For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

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For 2H2+O2→2H2O, what mass of H2O can form from 2.00 mol H2 when O2 is excess? Use 18.0 g/mol for H2O.

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