Question

the number of hydrogen atoms in 0.25 mole of H2SO4

Answer 1

1 mole of H2SO4 has 2 moles of Hydrogen atoms, 1 mole of Oxigen atoms and 4 moles os Sulfur atoms

1 : 2 = 0.25 : x

x = 0.50 moles

1 mole contains 6.02 x 10^23 atoms ( Avogadro's number)

1 : 6.02 x10^23 = 0.5 : x

x = 3.01 x 10^23 Hydrogen atoms

Answer 2

Answer: The number of hydrogen atoms in given amount of sulfuric acid is $6.022\times 10^{23}$.

Explanation:

According to mole concept:

1 mole of a compound contains $6.022\times 10^[23}$ number of atoms.

The given chemical compound to us is $H_2SO_4$

By Stoichiometry of the compound:

1 mole of sulfuric acid has $2\times 6.022\times 10^{23}=12.044\times 10^{23}$ number of hydrogen atoms.

So, 0.5 moles of sulfuric acid will contain  $\frac{2\times 6.022\times 10^{23}}{1}\times 0.5=6.022\times 10^{23}$ number of hydrogen atoms.

Hence, the number of hydrogen atoms in given amount of sulfuric acid is $6.022\times 10^{23}$.