Concentrations of solutions

2 marks · Easy

Calculate the amount of substance (in mol) in 200 cm³ of a solution with a concentration of 0.150 mol/dm³. Give your answer to 2 decimal places.

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0.03 mol (±0.005)

Also accept: 0.030 mol

Common mistakes: Not converting cm³ to dm³ (using 200 instead of 0.200); Using incorrect formula

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Marking points

M1 · 1 mark · Converts 200 cm³ to 0.200 dm³ and uses the formula amount = concentration × volume.

A1 · 1 mark · Correct answer: 0.03 mol (accept 0.030).

Worked solution

Volume in dm³ = 200 cm³ ÷ 1000 = 0.200 dm³