Which statement describes the relative masses of two different particles?
1.a neutron has less mass than a positron.
2.a beta particle has less mass than a neutron.
3.an alpha particle has less mass than a positron.
4.an alpha particle has less mass than a beta particle.

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

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Need on both questionswill markbr />