Question

A carbon compound containing only Carbon and Oxygen as an approx molecular mass of 290.

On analysis it is found to contain 50% by mass of each element . What is the molecular formula​

Answer 1

Answer:

The atomic mass of Carbon is 12 while that of Oxygen is 16.

Given that the molecular mass of the compound is 290 and that 50% by mass is carbon and oxygen, we can form the following equations,

Let the no. of Carbon atoms be X and the no. of Oxygen atoms be Y.

From the above data, the following can be concluded,

12 X = 290/2

=> X = 145/12

=> X = 12.08

Similarly,

16Y = 290/2

=> Y = 145/16

=> Y = 9.06

C12O9 is the molecular formula of the given compound.

Answer 2

Answer:

Explanation:

The empirical formula =c4o3​

mass =(4×12)+(3×16)=96

Molecular mass =290

n=290/96=3

molecular formula =n× Empirical formula

                               =3×c4o3

                              =c12o9