<u>Answer:</u>
<u>For a:</u> The number of moles of air present in the RV is 0.047 moles
<u>For b:</u> The number of molecules of gas is 
<u>Explanation:</u>
To calculate the number of moles, we use the equation given by ideal gas follows:

where,
P = pressure of the air = 1.00 atm
V = Volume of the air = 1200 mL = 1.2 L (Conversion factor: 1 L = 1000 mL)
T = Temperature of the air = ![37^oC=[37+273]K=310K](https://tex.z-dn.net/?f=37%5EoC%3D%5B37%2B273%5DK%3D310K)
R = Gas constant = 
n = number of moles of air = ?
Putting values in above equation, we get:

Hence, the number of moles of air present in the RV is 0.047 moles
According to mole concept:
1 mole of a compound contains
number of molecules.
So, 0.047 moles of air will contain
number of gas molecules.
Hence, the number of molecules of gas is 