Which substance has a molar mass of 142 g?

a. mgcl2
b. p2o5
c. bacl2
d. alcl3

B) P₂O₅

Explanation:

A) MgCl₂

Molar mass of Mg = 24

Molar mass of Cl = 35.5

Molar mass = 24 + 2×35.5 = 95 g/mol

B) P₂O₅

Molar mass of P = 31

Molar mass of  O = 16

Molar mass = 31 ×2 + 5×16 = 142 g/mol

C) BaCl₂

Molar mass of Ba = 137.33

Molar mass of  Cl = 35.5

Molar mass = 137.33 + 2×35.5 = 208.33 g/mol

D) AlCl₃

Molar mass of  Al = 27

Molar mass of  Cl = 35.5

Molar mass =  27 + 3×35.5 = 133.5

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

3

explanation: