What will be the molality of chloroform in the water sample which contains 15 ppm chloroform by mass?

Options

A. `1.25xx10^(-4)` m
B. `2.5xx10^(-4)` m
C. `1.5xx10^(-3)` m
D. `1.25xx10^(-5)`m

Explanation

To find the molality of chloroform in a water sample that contains 15 ppm chloroform by mass, we can follow these steps:

### Step 1: Understand the Definition of ppm
PPM (parts per million) indicates the mass of solute (chloroform) per million parts of the solution (water). In this case, 15 ppm means there are 15 grams of chloroform in 1,000,000 grams of water.

### Step 2: Identify the Mass of Solvent
From the definition of ppm, we know:
- Mass of chloroform = 15 grams
...