# chemistry

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What is the mass, in grams, of 7.40×1020 molecules of caffeine, C8H10N4O2

• chemistry -

what's the molar mass? That's the mass of one mole.

How many moles do you have?

7.40x10^20 / 6.02x10^23 = ?

Now multiply that by the molar mass.

• chemistry -

99

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