A sample of copper sulphate pentahydrate, CuSO4.5H2O contains 3.782 g of Cu. How many grams of oxygen are in this sample ?

Question

A sample of copper sulphate pentahydrate, CuSO4.5H2O contains 3.782 g of Cu. How many grams of oxygen are in this sample ? (A) 0.952 g (B) 3.809 g (C) 4.761 g (D) 8.576 g

Tardigrade Admin · Accepted Answer

CuSO4⋅5H2O has 1 mole of copper and 9 moles of oxygen atoms 63.5 g Cu ≡ 9 × 16 g of oxygen 3.782 g Cu ≡ (9×16×3.782/63.5) =8.576 of oxygen

Q. A sample of copper sulphate pentahydrate, $C u S O_{4} .5 H_{2} O$ contains 3.782 g of Cu. How many grams of oxygen are in this sample ?

0.952 g

3.809 g

4.761 g

8.576 g

$C u S O_{4} \cdot 5 H_{2} O$ has $1$ mole of copper and $9$ moles of oxygen atoms
$63.5 g C u \equiv 9 \times 16 g$ of oxygen
$3.782 g C u \equiv \frac{9 \times 16 \times 3.782}{63.5}$
$= 8.576$ of oxygen

Q. A sample of copper sulphate pentahydrate, CuSO4​.5H2​O contains 3.782 g of Cu. How many grams of oxygen are in this sample ?