## Chemistry: A Molecular Approach (3rd Edition)

$0.187\ g\ He$
1. Use Avogadro's number and the molar mass of helium as conversion factors in order to determine the number of grams of helium. 2. $2.82\times10^{22}\ atoms\ He\times\frac{1\ mol\ He}{6.022\times 10^{23}\ atoms\ He}\times\frac{4\ g \ He}{1\ mol\ He} = 0.187\ g\ He$