Calculate the molecular mass of chloroform (CHCl3). Given atomic masses: C = 12 u, H = 1 u, Cl = 35.5 u.

To calculate the molecular mass of chloroform (CHCl3), you need to determine the sum of the atomic masses of all the atoms in the molecule.

The molecular formula of chloroform (CHCl3) indicates that it consists of one carbon atom (C), one hydrogen atom (H), and three chlorine atoms (Cl).

Atomic masses:
C = 12 u
H = 1 u
Cl = 35.5 u

Molecular mass of chloroform (CHCl3):

Molecular mass = (Number of C atoms × Atomic mass of C) + (Number of H atoms × Atomic mass of H) + (Number of Cl atoms × Atomic mass of Cl)

Molecular mass = (1 × 12 u) + (1 × 1 u) + (3 × 35.5 u)

Molecular mass = 12 u + 1 u + 106.5 u

Molecular mass = 119.5 u

Therefore, the molecular mass of chloroform (CHCl3) is 119.5 atomic mass units (u).