Which of these changes most likely results in an increase in the volume of a gas? decreasing the pressure on the gas? cooling the gas? removing some of the gas form the sample?

Know the ideal gas law equation?

PV = nRT 

If you decrease P while keeping everything else constant, V increases. They are inversely related. 
P = 1/V
The first answer is correct.

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

It dont even matter because at the end of thre day we gone life like it ius s