If a 3.44-L flask of SO2 at 1.65 atm contains the same number of molecules..?

If a 3.44-L flask of SO2 at 1.65 atm contains the same number of molecules as a 5.00-L flask of H2 at -7 °C and 1.00 atm, what is the temperature (in °C) of the SO2?

a. 249 °C
b. 88 °C
c. -39 °C
d. 575 °C
e. 29 °C

Answer:
For H2 : p= 1.00 atm ; T = - 7 + 273 = 266 °C
n = pV / RT = 1.00 x 5.00 / 0.0821 x 266 = 0.229

T = pV / n R = 1.65 x 3.44 / 0.229 x 0.0821 = 302 K = 29°C

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