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AQA GCSE · Question 01.5 · Quantitative chemistry
Calculate the percentage of water contained in 2.5 g of hydrated copper sulfate.
(Mass of water = 0.9 g)
Calculate the percentage of water contained in 2.5 g of hydrated copper sulfate.
(Mass of water = 0.9 g)
How to approach this question
1. Recall the formula for calculating percentage by mass: (mass of part / total mass) × 100.
2. Identify the mass of the 'part' (water), which is 0.9 g.
3. Identify the total mass (hydrated copper sulfate), which is 2.5 g.
4. Substitute these values into the formula and calculate the result.
Full Answer
Percentage of water = (mass of water / total mass) x 100
Percentage of water = (0.9 g / 2.5 g) x 100
Percentage of water = 0.36 x 100 = 36%
To calculate the percentage of water, we use the formula:
Percentage = (mass of the component / total mass of the substance) × 100
In this case:
Mass of water = 0.9 g
Total mass of hydrated copper sulfate = 2.5 g
Percentage of water = (0.9 / 2.5) × 100
Percentage of water = 0.36 × 100
Percentage of water = 36%
Common mistakes
✗ Dividing the total mass by the mass of water (2.5 / 0.9).
✗ Forgetting to multiply by 100.
✗ Using the mass of anhydrous copper sulfate (1.6 g) instead of the total mass.
Practice the full AQA GCSE Chemistry Foundation Tier Paper 2
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