Final answer:
To calculate the total number of molecules of hydrogen in 0.25 mole of hydrogen, we can use Avogadro's number and multiply it by 0.25 mole.
Step-by-step explanation:
To calculate the total number of molecules of hydrogen in 0.25 mole of hydrogen, we can use Avogadro's number, which states that there are 6.022 × 10^23 molecules in 1 mole of any substance. So, in 0.25 mole, there would be:
0.25 mole * (6.022 × 10^23 molecules/mole) = 1.5055 × 10^23 molecules
Therefore, there are approximately 1.5055 × 10^23 molecules of hydrogen in 0.25 mole of hydrogen.
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