The formula for hydrated copper(ii) nitrate is cu(no3)2.xh2o. it contains 36.5% water crystallization by mass.

what is the value of x?

[ar= h: 1 ; n: 14; o: 16; cu: 64]

a) 4
b) 5
c) 6
d) 7

6

Explanation:

The percent mass is equal to the ratio between the mass of the component of interest and the total mass of the compound, multiplied by 100 % in case we need to express it as a percentage.

We may apply this knowledge to write the formula for copper(II) nitrate x-hydrate. Let's assume that we take 1 mole of the compound. Then we will divide x molar masses of water by the molar mass of the overall compound and multiply by 100 % to get the mass percent of water:

Here:

Substitute into the formula:

Solve for x: