Question

0.68 moles of calcium to calcium atoms​

Answer 1

$0.68 \: moles \: calcium \times \frac{6.02 \times {10}^{23} \: calcium \: atoms }{1 \: mole \: calcium}$

The (( mole calcium ))s are simplified so the answer is based on the number of calcium atoms.

$0.68 \times 6.02 \times {10}^{23} = 68 \times {10}^{ - 2} \times 602 \times {10}^{ - 2} \times {10}^{23}$

$= 68 \times 602 \times {10}^{ - 4} \times {10}^{23} = 40936 \times {10}^{19}$

$calcium \: atoms = 40936 \times {10}^{19}$

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And we're done.

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