Answers: 1
![\frac{1mole}{6.022x10^{23} atoms} *[1.3*10^{21}atoms]=2.16*10^{-3}mol](/tpl/images/0087/4856/8cc01.png)
![\frac{22.99g}{1mol}*[2.16*10^{-3}mol]=4.97*10^{-2}g](/tpl/images/0087/4856/a9900.png)
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