Calculate how many times: a) one sulfur atom is heavier than one helium atom; b) one molecule of sulfur dioxide SO2 is heavier

Calculate how many times: a) one sulfur atom is heavier than one helium atom; b) one molecule of sulfur dioxide SO2 is heavier than one oxygen molecule; c) one hydrogen molecule is lighter than one sulfuric acid H2SO4 molecule.

a) Ar (S) = 32, Ar (He) = 4, 32: 4 = 8.
Answer: 8 times.
b) Mr (SO2) = Ar (S) + 2 • Ar (O) = 32 + 2 • 16 = 64
Mr (O2) = 2 • Ar (O) = 2 • 16 = 32
64: 32 = 2
Answer: 2 times.
c) Mr (H2) = 2 • Ar (H) = 2 • 1 = 2
Mr (H2SO4) = 2 • Ar (H) + Ar (S) + 4 • Ar (O) = 2 • 1 + 32 + 4 • 16 = 98
98: 2 = 49
Answer: 49 times.