Question

A 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O. Find the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g.

Answer 1

The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

How to calculate mass of an element in a compound?

According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.

This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g

Next, we calculate the percent ratio of each element in the compound; CaSO4.

• Ca = 3.06g/10.4g × 100 = 29.42%
• S = 2.45g/10.4g × 100 = 23.56%
• O = 4.89g/10.4g × 100 = 47.02%

According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:

• Ca = 29.42/100 × 65.8g = 19.36g
• S = 23.56/100 × 65.8g = 15.50g
• O = 47.02/100 × 65.8g = 30.94g

Therefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.

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