Question

Number of moles present in 24.5 grams of H2SO4 is

Answer 1

⭕️A mole of an element has the same Number as the atomic mass number.

⭕️So for example if hydrogen is 1.00794 amu, then one mole of H is 1.00794 grams. 

⭕️Add up the masses of H, S and O in the equation: H2+S+O4.

✔️✔️✔️i.e (24.5g H2SO4) x (1 mol H2SO4)

=24.5 .

✔️✔️✔️In simple terms we can say that :-

⭕️98g----------»1 mole 

24.5--------»x 

<cross multiply>

98x=24.5
 
x=24.5/98 

x=0.25




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Answer 2

1 mole of a chemical substance is equal to mol.wt of that substance. 
98g--->1 mole 
24.5--->x 

Cross multiplication

98x=24.5 
x=24.5/98 
x=0.25

Therefore, Number of moles present in 24.5 grams of H2SO4 is 0.25