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Question

The mass of 100 litres of sulphur dioxide at STP is 144 g.


A

True

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B

False

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Solution

The correct option is B

False


Given volume of sulphur dioxide = 100 litres

Molar volume at STP (litres) = 22.4 L

In case of gases at STP,

Number of moles = Volume at STP (litres)Molar volume at STP (litres) .... (i)

Substituting the values of volume at STP and molar volume at STP in equation (i) we have
Number of moles = 10022.4
Hence, number of moles = 4.5

Mass of sulphur dioxide = Number of Moles x Gram molecular mass of Sulphur dioxide (SO2) ...(ii)
Gram molecular mass of SO2 = Atomic mass of sulphur + (2 x Atomic mass of Oxygen)
Gram molecular mass of SO2 = 32 + 2 x 1 = 64 g
Substituting the value of gram molecular mass SO2 and number of moles in equation (ii) we get:
The mass of 100 litres of sulphur dioxide at STP = 4.5 x 64 g
The mass of 100 litres of sulphur dioxide at STP = 288 g.


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