Question

Find the number of moles of NO2 molecules present in a volume of 0.1792 m3 at STP.

Answer 1

46g of NO

2

Molecular weight of NO

2

=14+2×16=46g

∴ moles of NO

2

=

molecularweightofNO

2

weightgiven

=

46

46

=1 moles

According to Avogadro law, 1 mole of any compound contains 6.022×10

23

molecules.

1 mole =46g of NO

2

always occupy 22.4l at STP

∴ it occupies 22400ml=22400cm

3

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