# Q.29. At 27$°$ C a cylinder of 20 L capacity contains three gases 0.502 g He, 0.250 g ${O}_{2}$ and 1.00 g ${N}_{2}$ respectively If all these gases behave ideally, the total pressure is (a) .044 atm (b) .065 atm (c) 1.50 atm (d) 0.208 atm

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