Question

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature? Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature? NaBr CO2 HCN N2 NH3

Answer 1

Answer: Option (a) is the correct answer.

Step-by-step explanation:

Sodium bromide (NaBr) is an ionic salt as it is formed by transfer of an electron from sodium to bromine atom.

Whereas
`CO_(2)`, HCN,
`N_(2)` and
`NH_(3)` are all covalent compounds. And, all of them exists as a gas at room temperature.

Also according to rate of diffusion law, rate of diffusion is inversely proportional to square root of molecular weight of gas.

Mathematically, Rate of diffusion =
`(1)/(√(M))`

Out of the given options NaBr has the highest molecular weight which is 102.894 g/mol.

Thus, we can conclude that NaBr is most likely not a gas at room temperature.