Question

Given the following masses, calculate the mass of water lost & determine the percent hydration.

mass of hydrate: 10.24g
mass of anhydrate: 8.74g
mass of water lost: ?
percent hydration: ?
i got 1.50g for mass of water lost & 15% for percent hydration but i just want to make sure. please show how you got the answers. thank you! (:

Answer 1

The mass of water lost from the hydrate is correctly calculated as 1.50 g. However, the percent hydration is slightly different, calculated as 14.65% when the mass of water lost is divided by the mass of the hydrate and then multiplied by 100%.

Step-by-step explanation:

To calculate the mass of water lost, you subtract the mass of the anhydrate from the mass of the hydrate: 10.24 g (hydrate) - 8.74 g (anhydrate) = 1.50 g of water lost. This calculation is correct based on the values provided.

To determine the percent hydration, you divide the mass of water lost by the mass of the hydrate, then multiply by 100%:

(1.50 g / 10.24 g) × 100% = 14.65%

Rounding to two decimal places, the percent hydration is 14.65%, which is slightly different from the 15% you provided. This likely suggests a rounding difference or possibly a calculation error in your original figure. The percent by mass of water reflects the composition of the hydrate in terms of its water content.

Answer 2

You are given the mass of hydrate which is 10.24g and the mass of anhydrate which is 8.74g. Hydrate means that it contains water and anhydrate means the substance has lost water during the process. So you just subtract them, 10.24g – 8.74g = 1.5g of water is lost. Percent hydration is equal to one subtracted to the mass of anhydrate divided by the mass of hydrate multiplied by 100. So we have, [1-(8.74g/10.24g)] *100 = 14.65% or 15%. Your answers are correct.