Question

Calculate the number of moles in 15.5g of CaSO4.5H2O

Answer 1

Answer:

No. of moles = 0.0685

Explanation:

Given mass, m = 15.5g

We need to find the number of moles in 15.5 g of CaSO₄.5H2O

First, we find the mass of CaSO₄.5H2O.

M = (1×40)+(1×32)+(4×16)+(5×18)

M = 226 g/mol

We know that,

Number of moles = given mass/molar mass

$n=\dfrac{15.5\ g}{226\ g/mol}\\\\n=0.0685\ \text{mol}$

Hence, there are 0.0685 moles in 15.5 g of CaSO₄.5H2O.