A250-ml aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/ml. what is the concentration in ppm?
a. 6.1 x 10^-8 ppm
b. 1.5 x 10^-5 ppm
c. 0.061 ppm
d. 15 ppm

The correct option is C.

Explanation:

ppm : It is used to measure the concentration of solute in a given volume of solution. ppm is basically parts per million.

Formula used :

We are given :

Mass of methanol =

(Conversion Factor : 1g = 1000mg)

Volume of solution = 250 mL = 0.250L   (Conversion Factor : 1L = 1000mL)

Now put all the given values in above equation, we get:

Concentration of methanol = 0.061ppm

Hence, the correct option is C.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.