Question

50% of by mass of a 2.2 moles mixture of He and Ar gasses is He. Calculate the mole number of He in the mixture?

Answer 1

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A mixture of 2 moles of helium gas (atomic mass =4 u), and 1 mole of argon gas (atomic mass = 40 u) is kept at 300 K in a container. The ratio of their rms speeds \left [ \frac{V_{rms}(helium)}{V_{rms}(argon)} \right ], is close to:

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Answer 2

Mole = given mass / molar mass.

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