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3.4 Using concentrations of solutions in mol/dm3

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Question 11
H

Solution X contains sodium carbonate at a concentration of 0.200 mol/dm3. Solution Y contains sodium carbonate at a concentration of 25.0 g/dm3. The relative formula mass of Na2CO3\text{Na}_2\text{CO}_3Na2​CO3​ is 106. Which statement is correct?

[1]
A

Y is more concentrated, because 0.200 mol/dm30.200\ \text{mol/dm}^30.200 mol/dm3 is the same as 21.2 g/dm321.2\ \text{g/dm}^321.2 g/dm3.

B

X is more concentrated, because 0.200 mol/dm30.200\ \text{mol/dm}^30.200 mol/dm3 is the same as 53.0 g/dm353.0\ \text{g/dm}^353.0 g/dm3.

C

X is more concentrated, because 25.0 g/dm325.0\ \text{g/dm}^325.0 g/dm3 is the same as 0.00189 mol/dm30.00189\ \text{mol/dm}^30.00189 mol/dm3.

D

Y is more concentrated, because 25.0 g/dm325.0\ \text{g/dm}^325.0 g/dm3 is the same as 2.65 mol/dm32.65\ \text{mol/dm}^32.65 mol/dm3.

Markscheme

3.4 Using concentrations of solutions in mol/dm3 Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Using concentrations of solutions in mol/dm3

40 exam-style questions on AQA GCSE Chemistry 3.4 Using concentrations of solutions in mol/dm3, covering 3.4.1 Concentration in mol/dm3. Each one has a worked solution and a mark scheme showing where the marks go.

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