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Question
How many atoms are there in 0.25 mole of hydrogen ?
Solution
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
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