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What is the molar mass of a compound for which 1 molecule has a mass of 9.5 x 10-22 grams?

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quinnellow | Student, College Freshman | (Level 1) Honors

Posted January 3, 2012 at 9:10 AM via web

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What is the molar mass of a compound for which 1 molecule has a mass of 9.5 x 10-22 grams?

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enotechris | College Teacher | (Level 2) Senior Educator

Posted January 3, 2012 at 1:09 PM (Answer #1)

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A mole is simply a count of something totalling 6.02 x 10^23, be it atoms, molecules, eclairs, or elephants. Conceivably, you could purchase a mole of eggs, instead of the usual dozen, if your store had a large enough warehouse. The molar mass of anything is the mass of one mole of that thing. If a single egg has a mass of 50 grams, then a dozen would have a mass of (50 grams * 12) or 600 grams.  In your example, if your 1 molecule of something has a mass of 9.5 x 10 ^-22 grams, then a mole of your molecules would have a molar mass of

(6.02 x 10^23) * (9.5 x 10^-22) = 57.19 x 10^1 or 571.9 grams,

or about the weight of a dozen eggs.

 

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