Question

find the number of molecules present in 198g of sulphric acid

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Answer 1

First calculate no of moles of H2SO4 in 198 grams of compound and molecular mass of H2SO4 is 98

So no of moles = 198/98=2.0204

1 mole of H2SO4 contains 2 moles of H(hydrogen), 1 mole of S (sulphur),4moles of O(oxygen).

So 2.0204 moles of H2SO4 contains 4.0408 moles of H, 2.0408 moles of S, 8.0816 moles of O.

Now 1 mole of a substance contains 6.022×10 23 molecules

So total atoms in 198 grams of H2SO4 = (4.0408+2.0204+8.0816)×6.022×1023 atoms.

Alternate method as we have total 2.0204 moles of compound we can see that compound has 2 molecules of H, 1 molecule of S, and 4 molecules of O . So in total there are 7 atoms in 1 molecule of H2SO4 so total atoms = 2.0204×7×6.022×1023

Hope it is helpful for u

Answer 2

Answer:

molecules of the sulpuric acid =no. of moles ×Avogadro's number

=12.044×10 23 molecules

Explanation:

i hope it's help you...........