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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