Select one: a. A = 2s, B = 2p, C = 2p, D = sigma_2s, bond order = 2, diamagnetic

Question

Select one: a. A = 2s, B = 2p, C = 2p, D = sigma_2s, bond order = 2, diamagnetic b. A = 2s, B = 2p, C = 2p, D = sigma_2s, bond order = 1, diamagnetic c. A = 2s, B = 2s, C = 2p, D = sigma_2s, bond order = 2, paramagnetic d. A = 2s, B = 2s, C = 2p, D = sigma_2s, bond order = 1, paramagnetic A micro-syringe used in gas chromatography has a maximum volume of 50 mL. A chemical reaction known to generate methane gas is sampled using the syringe twice. The first sample with a volume of 10.0 mL was determined to contain 7.71 times 10^-7 moles of methane gas. If a second sample of 25.0 mL was taken, with the reaction at the same temperature and pressure, how many moles of gas are in the 25.0 mL sample? Enter your answer to 3 significant figures using scientific notation - for example, 1.23E-4 represents 1.23 times 10^-4. Do not enter units. Consider a sample of gas in a tank. Under which of the following conditions would you expect least ideal behavior? Select one: a. High temperature and high pressure b. High temperature and low pressure

Explanation / Answer

Ideal gas equation: PV = nRT

At same pressure and temperature conditions:

V1/n1 = V2/n2

Volume of first sample, V1 = 10 mL

Volume of second sample, V2 = 25 mL

Moles of methane gas in first sample, n1 = 7.7 x 10-7

Applying V1/n1 = V2/n2 , we get

10 / 7.7 x 10-7= 25 / n2

Moles of methane gas in second sample, n2 = 1.93 x 10-6

Or n2 = 1.93E-6

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