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How to calculate volume of N2 gas at STP?
The temperature of N2 is 24.5°C, volume is 138 mL and barometric pressure is 101.18 torr. Thanks in advance
2 Answers
- KennyBLv 76 years ago
You must determine the moles of gas that you have.
P = 101.18 torr
V = 0.138 L
T = 298.7 K (you must use degrees K)
R = 62.363 torr-L/deg-mole
Once you know the moles, multiply by 22.4 L (the volume an ideal gas occupies at STP) and voila.
Your answer will be in L. Keep three significant figures.
- Dr WLv 76 years ago
if you start with this equation
.. P1V1 / (n1T1) = P2V2 / (n2T2)
rearrange
.. V2 = V1 x (P1 / P2) x (n2 / n1) x (T2 / T1)
identify and cancel anything held constant
.. moles is not mentioned.. so we assume it's constant so that n1 = n2 and n2/n1 = 1
dropping that term
.. V2 = V1 x (P1 / P2) x (T2 / T1)
plug and chug
.. V2 = (138mL) x (101.18torr / 760torr) x (273.15K / 297.65K) = ___mL
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get your calculator out.
