19. A sample of N₂ gas is contaminated with a gas A of unknown molar mass. The partial pressure of each gas is known to be 200. torr at 25°C. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at 2 times the rate of N₂. The molar mass of gas A is:
(A)7.00 g/mol
(B)56 g/mol
(C)14.01 g/mol
(D)112 g/mol
(E)none of these

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