Question

A 2.5 g sample of a hydrate of Ca(NOs) was heated, and only 1.7 g of the anhydrous salt remained. What percentage of water is in the hydrate?

Answer 1

32%

Step-by-step explanation:

To determine the percentage of water in the hydrate, we need to know the original amount of water that was present in the hydrate. We can calculate this by subtracting the amount of anhydrous salt remaining (1.7 g) from the original weight of the hydrate (2.5 g).

(2.5 g - 1.7 g) = 0.8 g

This tells us that 0.8 g of water was present in the original 2.5 g hydrate sample. To find the percentage of water, we divide the weight of the water by the weight of the original hydrate and multiply by 100.

(0.8 g / 2.5 g) * 100 = 32 %

So, 32% of the original 2.5 g hydrate sample was water.