What is the percentage composition of sulfur in As2S3?

Question

BlackTom AI · Accepted Answer

The question asks for the percentage composition of sulfur in the compound As2S3.
First, determine the molar mass contributions: arsenic (As) has an atomic mass of about 74.92 g/mol, and sulfur (S) has an atomic mass of about 32.06 g/mol.
In As2S3, there are 2 arsenic atoms and 3 sulfur atoms. So the total molar mass is: (2 × 74.92) + (3 × 32.06) = 149.84 + 96.18 = 246.02 g/mol.
Next, calculate the mass contributed by sulfur: 3 × 32.06 = 96.18 g.
Now compute the mass percentage of sulfur: (96.18 / 246.02) × 100 ≈ 39.1%. 
Note regarding the options: the provided data shows an empty list for answer options, so no alternative choices are available to compare against. The calculation above demonstrates how the sulfur percentage is obtained from the formula for percent composition in a compound.

MUF0041 Chemistry Unit 1 - Semester 1, 2025 2.12 Quiz: Percentage Composition and Empirical Formula

What is the percentage composition of sulfur in As2S3?

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