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15 April, 00:23

How many molecules of benzene (C6H6) are in 17.4 g of benzene?

(Show ALL work and answer with correct significant figures and units.)

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  1. 15 April, 02:28
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    1.34*10²³ molecules of C₆H₆

    Explanation:

    Firs ot all we need to the determine the amount of benzene, in 17.4 grams of it.

    Molar mass from benzene = 78 g/mol

    Let's convert the grams to mol → 17.4 g. 1mol / 78 g = 0.223 moles

    We know, that 1 mol of anything contains the Avogadro's Number, 6.02*10²³ particles. Let's count the molecules

    1 mol of benzene has NA molecules

    Therefore 0.223 moles must have (0.223. 6.02*10²³) / 1 = 1.34*10²³ molecules of benzene
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