Question

The number of moles present in 245 g of $H_2{SO}_4$ is

• A. 0.25
• B. 2.05
• C. 2.5
• D. 25

Answer 1

The correct option is C 2.5

Molecular mass of $H_{2}S{O}_4$ = $2\times 1+2\times 16+4\times 32=98$

So, 98 gm of $H_{2}S{O}_4$ = 1 mole of $H_{2}S{O}_4$

1 gm of $H_{2}S{O}_4$ = $\frac{1}{98}$ mole of $H_{2}S{O}_4$

245gm of $H_{2}S{O}_4$ = $\frac{245}{98}$moles of $H_{2}S{O}_4$

245gm of $H_{2}S{O}_4$ = 2.5 moles of $H_{2}S{O}_4$

Hence,option C is correct answer.