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? Hint: Determine the percent composition of As in As2S3 , then take that percent of 5.0 g.

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 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 contains mass of arsenic = 75 g

So, 5.0 g of contains mass of arsenic =

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

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.