MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryMole _ Equivalent ConceptPrevious Year Questions
Number of atoms of He in 100 u of He (atomic weight of He is 4) are (BCECE 2008)
A.25✓ Correct
B.100
C.50
D.100 × 6 × 10–23
Explanation
Given, Weight of Helium (He) = 100 u The atomic weight of helium = 4 Number of helium atoms = (Weight of helium / atomic weight of helium) = 100 25 4 Therefore, 25 helium atoms are present in 100 u weight of helium.
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