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A volume of 18.0 \rm L contains a mixture of 0.250 \rm mole~ N_2 , 0.250 \rm mole \rm O_2 , and an unknown quantity of \rm He. The temperature of the mixture is 0 \rm ^{\circ}C , and the total pressure is 1.00 \rm atm . How many grams of helium are present in the gas mixture?

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