Question

a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C?

What is the mass in this na2?

It would be much simpler to change quart to liters first, then torr to kpa

PV=nRT

n= PV/RT Temps in Kelvins, V in liters, P in kpa

1L=1.06qt

1.00 / 1.06 = 0.94339623

425 torr = 56.7 kpa

35= 308.15 k

56.7/0.0821*308.15 = 212814.921

Not sure what I'm doing wrong

Answer 1

You're STILL using 0.0821 for R and I distinctly remember saying when you use P in kPa R must be 8.314. To make things a little easier you could have changed to 0.946 L also.
P actually is 56.66 but rounding to 56.7 should be ok.
n = PV/RT
n = 56.7*0.946/(8.314*308)
n = about 0.02