[akaEMILY]

Determine the number of entities (atoms or molecules) of N2 in a closed 6.07 L container at a pressure of 6.41×103 torr and a temperature of -126.83 °C. Report your answer to three significant figures.

n=RT/PV

6410torr/760torr = 8.434211 atm
-126.83 degC + 273.15 = 146.32 K

n = (0.08206Latm/molK)(146.32K)/(8.434211atm)(6.07K)
n=0.234532 molN2 x (6.02x10^23)
= 1.41x10^23 molecules.

What have I done wrong?

[AWK]

Gas constant!

[akaEMILY]

What is wrong with my gas constant? I used the one with the atm 0.8206, I know I can use the 8.314 but that has J in it so I used the other one.

[akaEMILY]

Okay I figured out what I did wrong.. once again it's a SILLY mistake. It's n =PV/RT not n=RT/PV