A rigid tank contains 67.0 g of chlorine gas (Cl2) at a temperature of 76 °C and an absolute pressure of 5.10 x 105 Pa. Later, the temperature of the tank has dropped to 38 °C and, due to a leak, the pressure has dropped to 3.00 x 105 pa. How many grams of chlorine gas have leaked out of the tank? (The mass per mole of Cl2 is 70.9 g/mol.)

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Ideal Gas Law

Ideal gas law states that the product of pressure and volume of a gas directly varies with the product of the number of moles, the universal gas constant, and the temperature of the gas.