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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.

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