SELECT * FROM question_mgmt as q WHERE id=3288 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=8 AND chapterId=101 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)
The unit of length convenient on the atomic scale is known as an angstrom and is denoted by Å : 1Å = 10-10 m. The size of a hydrogen atom is about 0.5 Å what is the total atomic volume in m3 of a mole of hydrogen atoms?
Radius of hydrogen atom, r = 0.5 Å = 0.5 × 10-10 m
Volume of hydrogen atom = 4/3 π r3
= 4/3 x 22/7 x (0.5 x 10-10)3
= 0.524 x 1030 m3
1 mole of hydrogen contains 6.023 × 1023 hydrogen atoms.
∴ Volume of 1 mole of hydrogen atoms = 6.023 × 1023 × 0.524 × 10-30
= 3.16 × 10-7 m3
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