16. Which of these organic functional groups cannot form hydrogen bonds? 16. A)

Question

16. Which of these organic functional groups cannot form hydrogen bonds? 16. A) amide B) alcohol C) alkene D) carboxylic acid E) all of these can hydrogen bond 17. Professor Snape adds 0.1611 g of an unknown gas to a 125-mL flask. If Snape finds the pressure to be 736 torr at 20.0°C, is the gas likely to be methane, CH4. nitrogen, N2, oxygen, O2, neon, Ne, or argon, Ar? A) CH4 B) Ar C) Ne D) N2 18. Which of these factors gives rise to the primary structure of a protein? A) DNA sequence B) dispersion forces within the protein's interior. C) hydrogen bonding of backbone amides D) formation of helical and sheet regions E) interactions between the amino acid side chains 19. Polyamides such as kevlar can be prepared by the reaction of A) a diamine with a carboxylic acicd. B) a diamine with a dicarboxylic acid. C) an amine with a dicarboxylic acid. D) a diol with a dicarboxylic acid. E) an alcohol with a dicarboxylic acid.

Explanation / Answer

17)
Given:
P = 736.0 torr
= (736.0/760) atm
= 0.9684 atm
V = 125.0 mL
= (125.0/1000) L
= 0.125 L
T = 20.0 oC
= (20.0+273) K
= 293 K

find number of moles using:
P * V = n*R*T
0.9684 atm * 0.125 L = n * 0.08206 atm.L/mol.K * 293 K
n = 5.035*10^-3 mol

mass(solute)= 0.1611 g


use:
number of mol = mass / molar mass
5.035*10^-3 mol = (0.1611 g)/molar mass
molar mass = 32 g/mol

this is molar mass of O2
So, the gas is O2
Answer: E

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