The osmotic pressure of a 0.9 weight percent solution of sodium chloride (NaCl) is equal to the osmotic pressure of a 5 weight percent solution of non-dissociating molecule X. What is the molecular weight of molecule X

The molar mass of molecule X is 162.5 g/mol

Explanation:

We are given:

0.9 % of NaCl

This means that 0.9 grams of NaCl is present in 100 grams of solution

5 % of molecule X

This means that 5 grams of molecule X is present in 100 grams of solution

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

Or,

where,

i = Van't hoff factor

R = Gas constant =

T = temperature of the solution

According to the question:

Osmotic pressure of both the solutions are same.

So, the equation becomes:

where,

Putting values in above equation, we get:

Hence, the molar mass of molecule X is 162.5 g/mol

the answer is 0.42 is that is an option. this question provides no info

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

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