Question detail

Calculate the mass of 3 moles of calcium carbonate (CaCO3). The relative formula mass (Mr) of CaCO3 is 100.1 g/mol.

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. 300.3 g
B. 250.0 g
C. 150.0 g
D. 100.1 g

Answer

300.3 g

Explanation

To find the mass, use the formula: mass = moles x Mr. Here, mass = 3 mol x 100.1 g/mol = 300.3 g.

Common mistake

Significant Figures Confusion

Students often round their final answers to an inappropriate number of significant figures, ignoring the precision of the given data.

Always determine the number of significant figures based on the least precise measurement in your calculations and round your final answer accordingly.

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