The mass of an evacuated 255- mL flask is 143.187 g. The mass of the flask filled with 268 torr of an unknown gas at 25 C is 143.290 g.
Calculate the molar mass of the unknown gas.
Thanks in advanced
unknown mass..please help?
2012-03-05 4:41 am
回答 (1)
2012-03-05 10:45 am
✔ 最佳答案
We use n = PV / RT = 268 x .255 / 62.363 x (273+25) =0.003677 moles
these have mass of (143.290- 143.187) g = 0.103g
mass of 1 mole = .103 / .003677 = 28.01 g / mole ..possibly N2
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