The formula for hydrated copper(II) nitrate is Cu(NO3)2.XH20. It contains 36.5% water of
crystallisation by mass.
What is the value of x?
[Ar: H, 1; N, 14; 0, 16; Cu, 64]
A. 4
B. 5
C. 6
D. 7
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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:
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