What do we need to know about a molecule in order to carry out molarity calculations?

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

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .