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(a) Why air is dense at the sea level? Explain. (b) Calculate the total pressure in a mixture of 4g of O2

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(a) Why air is dense at the sea level? Explain. 

(b) Calculate the total pressure in a mixture of 4g of O2 and 2g of H2 confined to a total volume of 1 L at 0°C. (R = 0.821 L atm mol-1)

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(a) Heavier gas will come down and lighter air goes up. Air at sea level is denser due to compression by mass of air above it.

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