A helium gas (He) leak resulted in a rectangular vessel (200 cm x 20 cm x 10 cm) becoming pressurized at a temperature of 20 °C with 400 g of helium.  Given that the van der Waals constants for helium (He) are:  a (L2 atm mol-2) = 0.034b (L mol-1) = 0.02370 (i) Calculate the pressure exerted by the helium gas in the vessel.     (ii) Calculate the root mean square speed of a He atom at 20 °C.

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