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Compute the total pressure atmosphere (atm) of a mixture of helium gas, He of 0.0200 mol  and 0.0100 mol of hydrogen, H2 in a 2.50L flask at 10 degrees celcius

A sample of water 53 g with a temperature of thirty six degree celsius is combined to 250 grams of H2O at 91 degree Celsius  in an insulated container. Determine the final temperature after thermal equilibrium is reached?

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