How many moles of sucrose would you have if you have 7.2x10^23
molecules of sucrose? *

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

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 effect does nuclear radiation have on atoms?