Question

The molecular mass of x is 28 . x cannot be a. CO b. N2 c. C2H4 d. O2

Answer 1

D) O2

Question:

The molecular mass of x is 28 . x cannot be:

a. CO b. N2 c. C2H4 d. O2

Answer:

For solving this question we have to calculate the molecular mass of each compound separately:

Calculating Molecular Mass of Carbon Monoxide (CO):

Molar mass of Carbon = 12

Molar mass of Oxygen = 16

Molecular Mass of Carbon Monoxide:

= 12 x 1 + 16 x 1

= 12 + 16

= 28

Calculating Molecular Mass of Nitrogen (N2):

Molar mass of Nitrogen = 14

Molecular mass of N2

= 14 x 2

= 28

Calculating Molecular Mass of Ethene (C2H4):

Molar mass of Carbon = 12

Molar mass of Hydrogen = 4

Molecular mass of Ethene:

= 12 x 2 + 1 x 4

= 24 + 4

= 28

Calculating Molecular Mass of Oxygen (O2):

Molar mass of Oxygen = 16

Molecular mass of Oxygen:

= 16 x 2

= 32

Therefore, after calculating the molecular mass of all the compounds we get to know that Oxygen has the molecular mass of 32 which is different from all the other compounds that are there. Option (D) O2 is the correct answer.