Question

The mineral orpiment, having the empirical formula As2S3, was used in ancient times as a cosmetic. What mass of arsenic is present in 5.0 g of orpiment? [Given: naturally occurring arsenic is all arsenic-75; assume that all naturally occurring sulfur is sulfur-32 (only approximately true)]

Answer 1

Answer : The mass of arsenic present in 5.0 g of orpiment is, 1.5 grams.

Explanation : Given,

Mass of orpiment = 5.0 g

As we know that the molar mass of $As_2S_3$ is, 246.02 g/mol and the molar mass of As is, 75 g/mol.

As per the question, we conclude that:

As, 246.02 g of $As_2S_3$ contains mass of arsenic = 75 g

So, 5.0 g of $As_2S_3$ contains mass of arsenic = $\frac{5.0}{246.02}\times 75=1.5g$

Thus, the mass of arsenic present in 5.0 g of orpiment is, 1.5 grams.

Answer 2

The mass of arsenic present in 5.0 g of orpiment is 1.5 grams.

Calculation of the mass:

Since  the molar mass of As2S3 is, 246.02 g/mol and the molar mass of As is, 75 g/mol.

So here the mass of 5.0g should be

= 5.0/246.02 * 75

= 1.5g

hence, The mass of arsenic present in 5.0 g of orpiment is 1.5 grams.

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