Question

how many atoms are present in 5 mole of hydrogen ?

Answer 1

AS WE KNOW THAT HYDROGEN = $H_{2}$
therefore in 5 gram of hydrogen there will be
$\frac{5}{2} moles$
or = 2.5 moles
now as no. of atom = no. of moles × $N_{A}$
= 2.5 × 6.022×$10^{23}$
= 15.055 × $10^{23}$
= 1.5055× $10^{24}$
hope it helps you