Question

. Rank the following in order of increasing mass: 1.0 mole of methane (CH4), 0.50 mole of water (H2O), 0.20 mole of Fe, and 0.010 mole of U. I know the answer is U<H2O<Fe<CH4 but why cant the answe

r be U<Fe<H20<CH4 isn't 0.50 bigger than 0.20