Question 2
What mass of sodium chloride is needed to make 2 dm³ of a 1 mol dm⁻³ solution? (Na = 23.0, Cl = 35.5)
The right answer is the one marked above.
117 g. The molar mass is 58.5 g mol⁻¹, so one cubic decimetre needs 58.5 g and two need twice that.
29.25 g is the answer for 500 cm³ and 58.5 g is the answer for 1 dm³ — both are worked in the skill, and picking one of them here means the volume in the question was not read.