Question

An unknown substance is reported to have the following composition: 21.2%N, 6.1%H, 24.2%S, and 48.5%O. If we assume there is 100 grams of the substance, how many moles of oxygen would there be?

Answer 1

The number of mole of oxygen in substance is 3.03 moles

Data obtained from the question

• Nitrogen = 21.2%
• Hydrogen = 6.1%
• Sulphur = 24.2%
• Oxygen = 48.5%
• Mass of substance = 100 g

• Mole of oxygen =?

How to determine the mass of oxygen

• Mass of substance = 100 g
• Oxygen = 48.5%
• Mass of oxygen =?

Mass of oxygen = Percent of oxygen  × 100

Mass of oxygen = 48.5% × 100

Mass of oxygen = 48.5 g

How to determine the mole of oxygen

• Mass of oxygen = 48.5 g
• Molar mass of oxygen = 16 g/mol
• Mole of oxygen =?

Mole = mass / molar mass

Mole of oxygen = 48.5 / 16

Mole of oxygen = 3.03 moles

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