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Pirzada Koushtubh Bhalla
Asked: 2022-11-11T16:04:07+05:30 In:

Which one of the following is the lightest
A. 0.2 mole of hydrogen gas
B. `6.023xx10^(22)` molecules of nitrogen
C. 0.1 g of silver
D. 0.1 mole of oxygen gas

Which one of the following is the lightest
A. 0.2 mole of hydrogen gas
B. `6.023xx10^(22)` molecules of nitrogen
C. 0.1 g of silver
D. 0.1 mole of oxygen gas
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  1. Correct Answer – C
    (a) Moles = given wt./molecular wt.
    Weight of `H_(2)=` moles `xx` molecular wt.
    `=0.2xx2=0.4 g`
    (b) `6.023xx10^(23)` represents 1 mole
    Thus `6.023xx10^(22)` will represent 0.1 mole
    Wight of `N_(2)=0.1xx28=2.8=2.8 g`
    (c) Weight of silver `=0.1 g`
    (d) Weight of oxygen `=32xx0.1=3.2 g`
    (e) Weight of water `=1 g`
    Thus, 0.1 g silver is the lightest.

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