Calculations with equations involving solutions

2 marks · Easy

The equation for a reaction is:

Calculate the number of moles of silver nitrate, AgNO₃, required to react with 0.030 mol of sodium carbonate, Na₂CO₃.

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0.060 mol (±0.001)

Also accept: 0.06 mol

Common mistakes: Incorrect mole ratio

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Marking points

M1 · 1 mark · Identifies the correct molar ratio from the equation: 2 mol AgNO₃ : 1 mol Na₂CO₃.

A1 · 1 mark · Multiplies 0.030 mol by 2 to get 0.060 mol AgNO₃. (follow-through)

Worked solution

From the balanced equation, 2AgNO₃ reacts with 1 Na₂CO₃.

So, for 0.030 mol Na₂CO₃: