Question

potassium permanganate is heated to give 1.3 to grams of oxygen is equal to one litre and one litre of hydrogen contains 0.08 25 grams what is the molecular mass of oxygen​

Answer 1

Explanation:

Let $$P$$ be the pressure and $$V$$ be the volume of oxygen gas and hydrogen gas.

Then,

For oxygen gas

$$PV=\frac{1.32}{M}\times R\times298$$

where M is the relative molecular mass of oxygen gas

For hydrogen gas

$$PV=\frac{0.0825}{2}\times R\times298$$

Now,

$$\frac{1.32}{M}\times R\times298=\frac{0.0825}{2}\times R\times298$$

$$M=\frac{1.32\times2}{0.0825}$$

$$M=32g$$

Hence, relative molecular mass of oxygen gas is 32 gm