How many atoms are present in 10 moles of a hydrogen atom?

The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 10²³.

1 mole of Hydrogen atom $=$ $6.022\times {10}^{23 }$atoms

10 moles of H $$\begin{gathered} = 10\times 6.022\times {10}^{23} \\ = 6.022\times {10}^{24} \end{gathered}$$ atoms