A sample of a hydrate has a mass of 5.026 g. After it is heated, it has a mass of 3.492 g. What is the percentage by mass of water in the hydrate?
1. 19.40%
2. 27.92%
3. 30.52%
4. 69.48%
hydrate has a mass of 5.026 g After it is heated, it has a mass of 3.492 g, that means the mass of water is mH2O=5.026-3.492=1.534g using the main formula %H2O= (mass of water / mass of hydrate ) x100= 30.52% the answer is 3. 30.52%
