Question

Gram molecular mass of carbon is:
(a).6g
(b).11g
(c).12g
(d).14g

Answer 1

Hint: Do not confuse atomic mass with atomic number. Atomic number refers to the number of electrons present in the element. Refer to the periodic table to solve this question.

Complete answer:
“The mass in grams of one mole of substance is called molar mass”. It should be noted that each element has its own unique molar mass. All elements have different molar masses. It is due to the fact that the atoms of different elements contain different numbers of protons, neutrons, and electrons, and therefore they have different masses.
Molar mass of an element and atomic mass of an element have the same value. They can be related as –
\[\text{Molar mass of an element=}\dfrac{\text{(atomic mass from periodic table) g element}}{\text{1 mole element}}\]
Carbon is an element with atomic number 6. It is a p-block element, present in Group 14 and 2nd period. It has an atomic mass of 12 atomic mass units or 12g.

Therefore, the answer is – option (c) – Gram molecular mass of carbon is 12g

Note:
Molecular weight is also called mass number. The mass number is nothing but the sum of the number of protons and number of neutrons present in the nucleus of the atom.