Question 77 of 144 in Chemical Formulae, Equations and Calculations Part 2

Calculations with equations involving solutions

1 mark · Easy

State the mass of sodium chloride, NaCl, produced when 0.025 mol of NaCl is formed in a reaction.

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1.46 g (allow 1.5 g to 2 significant figures)

Also accept: 1.5 g; 1.46g; 1.46 grams; 1.5g

Common mistakes: Not converting moles to mass using Mr (58.5)

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Marking points

A1 · 1 mark · Correct mass calculated using mass = moles × Mr: 0.025 × 58.5 = 1.46 g (accept 1.5 g to 2 s.f.).

Worked solution

Mr(NaCl) = 23 + 35.5 = 58.5

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