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2 mol H2SO4

answer is c

.........................

but why

One mole of H2SO4 contains 7 atoms (2 H, one S and 4 O). But you have 2 moles of H2SO4, so you need to multiply 2 by 7 and you get 14.

Perform the same procedure for all other compounds and you will see that 2 mol of H2SO4 has the largest number of atoms.

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