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Aluminum sulfide has a molar mass of 150.16 grams per mole. This means there are 0.666 moles present, or 4.01 E23 molecules. Each molecule of Al2S3 has 2 aluminum atoms, so there are 8.02 E23 atoms of aluminum present.

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Q: How many atoms of aluminum are there in a sample of aluminum sulfide with a mass of 100 g?
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