Question detail

What is the mass of 3 moles of carbon dioxide (CO2)?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to masses of pure substances

Question

A. 66 g
B. 44 g
C. 132 g
D. 22 g

Answer

132 g

Explanation

The relative formula mass of carbon dioxide (CO2) is 44 g/mol. Using the formula mass = moles x Mr, we find mass = 3 mol x 44 g/mol = 132 g.

Common mistake

Misunderstanding Mole Ratios

Students often confuse the coefficients in a balanced equation as mass ratios instead of mole ratios.

Emphasize that coefficients represent the number of moles of each substance, not their masses. Practice interpreting balanced equations to reinforce this concept.

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