Which is expected to have the largest dispersion forces? Which is expected to have the largest...
Which is expected to have the largest dispersion forces? Which is expected to have the largest dispersion forces? C18H36 K NH3 C4H8
Homework Answers
Dispersion forces depend on the magnitude of molar mass of molecule.
The one with greater molar mass will have greater dispersion forces.
Molar mass of C18H36,
MM = 18*MM(C) + 36*MM(H)
= 18*12.01 + 36*1.008
= 252.468 g/mol
Molar mass of K = 39.1 g/mol
Molar mass of NH3,
MM = 1*MM(N) + 3*MM(H)
= 1*14.01 + 3*1.008
= 17.034 g/mol
Molar mass of C4H8,
MM = 4*MM(C) + 8*MM(H)
= 4*12.01 + 8*1.008
= 56.104 g/mol
Molar mass is largest for C18H36.
So, C18H36 has largest dispersion forces.
Answer: C18H36
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