the K of water is 0.51°C/m. What is the new boiling point when 2 mol of sodium fluoride is added to 3.5kg of water?

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

What volume would 2.25 moles of ne has occupy at stp?

How can the periodic table be used to predict the behavior of elements?