Question

How many atoms are there in 0.25 mole of hydrogen ?

Answer 1

0.25 moles of hydrogen
Number of hydrogen atoms in 1 mole = 6.022 × 10²³
Therefore, number of atoms in 0.25 moles = 6.022 × 10²³ × 0.25 = 1.50 × 10²³ atoms
Hence, number of hydrogen atoms in 0.25 moles is 1.50 × 10²³