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Selina Solutions Class 9 Chemistry Solutions for Exercise Number Problems in Chapter 7 - Chapter 7 Study Of Gas Laws
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Question 28 Number Problems
22.4 liters of gas weighs 70 g at S.T.P. Calculate the eight of the gas if it occupies a volume of 20 liters
at 27oC and 700 mm Hg of pressure.
Answer:
Step 1
V1 = 20 litres
P1 = 700 mm
T1 = 300 K
V2=?
T2 = 273 K
P2 = 760 mm
By gas equation
P1V1/T1 = P2V2/T2
700 x 20 /300= 760 x V2/273
V2 = 791 x 7/76 = 637 = 16.76/38
Step 2
22.4 litres of the gas at STP weighs = 70 g
16.76 litres of the gas has a weight at STP =
70 x 16.76/22.4 = 52.38
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