What is the wavelength of a photon with an energy of 3.50 x 10^-19 J ?

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

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

What is dhmo? hint: you find it everywhere something is wet..