Question

The mass (in g) of Kaolin, (${Al}_2{Si}_2{O}_7\cdot 2H_{2}O)$ which is required to prepare $10$ g of ${Al}_2{\left(S{O}_4\right)}_3\cdot 18H_{2}O$ is (as nearest integer) :

Answer 1

According to principle of atom conservation for Al atom,
$2\times 27\times \frac{x}{258}=10\times 2\times \frac{27}{666.4}$
$x=3.87g$
So, nearest integer is 4 g.