First slide

Werner's theory

Question

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

Moderate

A

0.952 g
B

3.809 g
C

4.761 g
D

8.570 g

Solution

Sample ${CuSO}_{4} . 5 H_{2} O$
$[Cu {(H_{2} O)}_{5} {SO}_{4}]$
63 g of Cu = 144 g (Oxygen)
3.782 g Cu = ?
$= \frac{144 \times 3 .782}{63} = 8 .570 g (Oxygen)$

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