Calculate total pressure of a mixture that contains 1 gram of hydrogen and 1 gram of helium in 5 litre at 21°C ?

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Answer 1 · 2018-03-23T11:18:17

#"3.62 atm"#

Moles of Hydrogen in mixture

#"n"_("H"_2) = "1 g"/"2 g/mol" = "0.5 mol"#

Moles of Helium in mixture

#"n"_"He" = "1 g"/"4 g/mol" = "0.25 mol"#

Total moles in the mixture

#"n" = "n"_("H"_2) + "n"_"He" = "0.5 mol + 0.25 mol = 0.75 mol"#

From ideal gas equation, calculate total pressure

#"PV = nRT"#

#"P" = "nRT"/"V" = "0.75 mol × 0.0821 L atm / (mol K) × 294 K"/"5 L"#

#"P = 3.62 atm"#