How many atoms are in a sample of 72.8 grams calcium ?

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asked May 1, 2017 115k views

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Rapfaria · Answer 1 · 2017-05-06T21:53:11+0000

first find the moles
moles of the calcium= 72.8 / 40
moles of calcium in 72.8g = 1.82mol

number of atoms= moles x Avogadro constant
atoms = 1.82 x 6.02x10+23
so the number of atoms is 1.096x10+24

How many atoms are in a sample of 72.8 grams calcium ?

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