If a substance has a molar mass of 50.0 g/mol and you have 0.5 moles, what is the mass?

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Multiple Choice

If a substance has a molar mass of 50.0 g/mol and you have 0.5 moles, what is the mass?

Explanation:
Mass comes from multiplying the amount in moles by the molar mass: mass = n × M. Here, each mole weighs 50.0 g, and you have 0.5 moles, which is half a mole. Half of 50.0 g is 25.0 g, so the mass is 25.0 g. The units make sense because moles cancel out, leaving grams. This also shows the idea that changing the amount in moles scales the mass proportionally: more moles means more mass, fewer moles means less mass.

Mass comes from multiplying the amount in moles by the molar mass: mass = n × M. Here, each mole weighs 50.0 g, and you have 0.5 moles, which is half a mole. Half of 50.0 g is 25.0 g, so the mass is 25.0 g. The units make sense because moles cancel out, leaving grams. This also shows the idea that changing the amount in moles scales the mass proportionally: more moles means more mass, fewer moles means less mass.

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