Question

hydrated calcium sulphate has the formula of CASO4.2H2O
1. WHAT IS THE NAME GIVEN TO THE WATER MOLECULES PRESENT IN THE SALT
2. calculate the % of water molecules in hydrated calcium sulphate. [Ca=40;S=32; O = 16; H = 1]​

Answer 1

Answer: water of crystallisation

Explanation: mass of water of crystallisation = 36 g/mol

So percentage = 36/Molar mass × 100

= 36/72 + 36 + 64 × 100

36/172 × 100 = 20.9 %