Starting with the following equation, PA(s) + F2(g) → PF3(g)
calculate the moles of F, that will be
required to produce 37.5 grams of PF3.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

c, liquids evaporate, creating a gas