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Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution