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

User Alex Stephens
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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
User Rapfaria
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