Ideal Gas equation question

In an experiment to find the relative molecular mass of an organic compound Q, 0.20g of liquid Q was injected into a gas syringe to form 85.0cm^3 of gaseous Q. The gas syringe was encased in a syringe oven at a temperature of 450K. The pressure was measured as 1.01kPa
Gas constant, = 8.31J K^-1mol^-1

Calculate relative molecular mass of Q

My working out
pv=nrt
n=pv/rt
I converted everything
P = 1010Pa
V= 0.00085m3
n=
R-8.31J K^1mol^1
T=450k

1010x0.000085 / 8.315x450 = 2.29

n= mass/molar mass
molar mass= mass/moles
0.20/2/29 = 0.08

Just want to check if it's right not sure...

1.01 kPa is VERY low, was it not 101 kPa i.e. 1 atm?

85.0 cm3 = 85.0 x 10^-6 m3 i.e. 0.000085 m3, you missed a zero the first time you wrote it, but fixed it in the equation.

You initially showed R as 8.31, but then wrote 8.315, but it is 8.314.

You should have noticed that you answer cannot be correct since you've ended up with an Mr of <1.

In the question, It's written as 1.01kPa. I'm not sure why if it is too low.
I think I accidently missed a zero so I'm going to fix that so others don't get confused.
The gas constant in the question I've got is 8.31. But I think I've wrote it wrong. I fix these errors but I'm not sure what else to do if my Mr is 0.08. Thank you for helping.

You've written it: "1010x0.000085 / 8.31x450 = 2.29"

But it doesn't. 1010x0.000085 / 8.31x450 = 2.29 x 10^-5. Which leads to Mr = 8711

BUT, I am right! P = 101kPa not 1.01kPa. This leads to Mr = 87, which is something like pentanamine.

Why do I say I am right? Who the hell would set up an experiment to heat an organic liquid to find its Mr, but do it at 0.01 atm of pressure?

You've written it: "1010x0.000085 / 8.31x450 = 2.29"

But it doesn't. 1010x0.000085 / 8.31x450 = 2.29 x 10^-5. Which leads to Mr = 8711

BUT, I am right! P = 101kPa not 1.01kPa. This leads to Mr = 87, which is something like pentanamine.

Why do I say I am right? Who the hell would set up an experiment to heat an organic liquid to find its Mr, but do it at 0.01 atm of pressure?

Could you show me how you worked it out to get 87? Thanks.