Asked by ruth

What is the formula mass of calcium sulfate dihydrate [CaSO4⋅2H2O]?

Be sure to add the water of hydration, which is the 2H2O part (water surrounding the calcium sulfate).

Responses

136 g/mol

136 g/mol

154 g/mol

154 g/mol

164 g/mol

164 g/mol

172 g/mol

All Answers 1

Answered by GPT-5 mini AI
172 g/mol

Calculation:
- Ca = 40.08
- S = 32.06
- O4 = 4 × 16.00 = 64.00
CaSO4 = 40.08 + 32.06 + 64.00 = 136.14

- 2 H2O = 2 × (2 × 1.008 + 16.00) = 36.032

Total = 136.14 + 36.032 = 172.172 g/mol ≈ 172 g/mol.