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Question

Balloon of 4L capacity are to be filled with hydrogen at a pressure of 1 atm and 27°C from an 8L cylinder containing hydrogen at 10 atm at the same temperature.the number of balloons that can be filled is 1) 20          2)18          3) 40         4)38


Solution

Consider capacity of each balloon = n1 moles
Total moles of gas =n2 moles
From PV=nRT (R=0.0821LatmK-1mol-1)
n1 = 0.162 moles
n2 = 3.25 moles
Number of balloons that can be filled = n2/n1
                                                            = 3.25 / 0.162
                                                            = 20
therefore 20 balloons can be filled.

Chemistry

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