Question

a compound contains 4% oxygen by mass find the minimum molecular mass of compound​

Answer 1

Heya !!

Let's say the mass of the compound is x.

By mass, it contains 3.2 % oxygen.

The atomic mass of oxygen is 16g.

Let there be 100g compond in which thereis 3.2 g oxygen.(To take the minimum mass, assume that there is 1 oxygen atom in it )But, actually it's 16 g not 3.2 g.

So, using unitary method,If 3.2 g of oxygen = 100g of compound 16g of oxygen = x gram of compound.

Solving for x:X= 100*16/3.2 = 500

Ans.---> 500

Answer 2

Answer:

the molecular mass will be 4÷100 ×12= 0.36 please mark as best