Question detail

What mass of sodium chloride (NaCl) is produced from 2 moles of Na reacting with excess Cl2? The relative formula mass (Mr) of NaCl is 58.5 g/mol.

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

At a glance

MCQ

Type

practice

Style

Topic

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

Question

117 g

The mass of NaCl produced is calculated using the formula mass = moles x Mr. Here, mass = 2 moles x 58.5 g/mol = 117 g.

Confusing Ratios

Students often confuse mole ratios with mass ratios when balancing equations, leading to incorrect calculations.

To avoid this mistake, always identify whether you are working with moles or masses and use the correct ratios from the balanced equation.

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