Question detail

If 4 moles of calcium carbonate (CaCO3) are produced, how many grams of calcium carbonate is that? The relative formula mass (Mr) of CaCO3 is 100 g/mol.

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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. 400 g
B. 350 g
C. 450 g
D. 300 g

Answer

400 g

Explanation

The mass is calculated using the formula mass = moles x Mr. Here, mass = 4 mol x 100 g/mol = 400 g.

Common mistake

Confusing Mole Concept

Students often think that one mole of different substances contains different numbers of particles.

Emphasize that one mole of any substance, regardless of its type, contains the same number of particles, which is defined by the Avogadro constant (6.02 x 10^23).

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