Atomic mass of one molecule of H2SO4 is 98 Atomic mass unit.
Atomic mass of one mole of H2SO4 is 98 grams.
So 98 grams of H2SO4 contains 1 mole of H2SO4 molecule i.e., 7 moles atoms.
So, by applying the basic maths, we get
49 grams of H2SO4 contains 1/2 mole of H2SO4 molecule i.e., 3.5 moles atoms.
Hope it helps.
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