Answer
Hydrogen has more atoms.
Work Step by Step
Number of atoms= No of moles $\times N_{A}$.
Number of hydrogen atoms= $\frac{0.302g}{1.008gmol^{-1}}\times\frac{6.022\times10^{23}}{1mol}\approx1.80\times10^{23}$.
Number of Chromium atoms = $\frac{14.7g}{51.996gmol^{-1}}\times\frac{6.022\times10^{23}}{1mol}\approx 1.70\times10^{23}$. Comparing the results, we find that hydrogen has more atoms.
