Hello All

Im having a bit of trouble with some calculations. I would like to know how to calculate the size of charge (in grams) of R1234yf I would need to add to a hose that would result in a desired pressure at a certain temp.

Specifics:
Volume of Line: 15 cm^3
Volume of Oil: PAG 3% of volume = 0.45 cm^3
Temp: 135C
Desired pressure: 2 MPa

I tried calculating myself using ideal gas laws but I dont believe R1234yf would act ideal. My numbers seem low and I would like a math/fundamentals check.

Thanks in advance,