Answer
$3.07\times10^{24}\,atoms$
Work Step by Step
1 mole contains $6.022\times10^{23}$ atoms.
$\implies 5.10\,mol= 5.10\,mol\times\frac{6.022\times10^{23}\,atoms}{1\,mol}$
$=3.07\times10^{24}\,atoms$
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