Find the percentage by mass of sulphur in calcium sulphate CaSO4 . Give answer up to one place of decimal (Ca=40u, S=32u, O=16u).
Question
Find the percentage by mass of sulphur in calcium sulphate CaSO4 . Give answer up to one place of decimal (Ca=40u, S=32u, O=16u).
Solution
To find the percentage by mass of sulphur in calcium sulphate (CaSO4), follow these steps:
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First, calculate the molar mass of CaSO4. The molar mass is the sum of the atomic masses of all the atoms in a molecule.
Molar mass of CaSO4 = (1 x 40u for Ca) + (1 x 32u for S) + (4 x 16u for O) = 40u + 32u + 64u = 136u
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Next, find the part of the molar mass that is due to sulphur. In this case, it's 32u.
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Finally, calculate the percentage by mass of sulphur in CaSO4. The formula to calculate the percentage by mass is:
(Part / Whole) x 100%
So, the percentage by mass of sulphur in CaSO4 is:
(32u / 136u) x 100% = 23.5%
So, the percentage by mass of sulphur in calcium sulphate (CaSO4) is 23.5%.
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