Explain the observed trend in the melting points of the hydrogen halides. hi -50.8 ? c hbr -88.5 ? c hcl -114.8 ? c hf -83.1 ? c

As molecular mass increases, van der Waals interactions between molecules also increase, because numbers of electrons in the molecules.

Iodine (I) has greatest atomic number, so the number of electrons.

Hydrogen fluoride is exception, because hydrogen bonding between molecules.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

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