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Which has the smallest dipole-dipole forces? a) Cl2 b) CH3CH2Cl c) H2Se d) PH3

Which has the smallest dipole-dipole forces? a) Cl2 b) CH3CH2Cl c) H2Se d) PH3 How much energy is required to heat 87.1 g acetone (molar mass = 58.08 g mol-1) from a solid at -154.0 °C to a liquid at -42. 0°C? The following physical data may be useful: ΔfusH = 7.27 kJ mol-1 Cliq = 2.16 J g-1 °C-1 Cgas = 1.29 J g-1 °C-1 Csol = 1.65 J g-1 °C-1 Tmelting = -95.0 °C a) 18.5 kJ b) 9.97 kJ c) 32.2 kJ d) 8.48 kJ e) 29.4 kJ What is the edge length of a face-centred cubic unit cell made up of atoms having a radius of 125 pm? a)1000 pm b)354 pm c)500 pm d)177 pm