Q7. Calculate the percentage composition of potassium nitrate.
Q8. Calculate the percentage composition of chromium in ammonium
dichromate.
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Explanation:
Molecular mass of potassium nitrate is 39 + 14 + 3x16 i.e. 101 gper mol
now atomic mass of potassium is 39 g per mol
so percent is 39 / 101 X 100
i.e. 38.61 %
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