Question

What is the weight of 3 gram atoms of sulphur?
A) 96 g
B) 99 g
C) 100 g
D) 3 g

Answer 1

Hint: Atomic Mass: The quantity of matter contained in an atom of an element is known as atomic mass.
To calculate the atomic mass of a single atom of an element, we add up the mass of protons and neutrons. The mass of a given atom, measured on a scale in which the hydrogen atom has the weight of one.
Mass of one atom is equal to its atomic mass. The atomic mass of sulphur is 32 g.

Complete answer:
It is known to us that Atomic mass of sulphur = 32 g
And we are supposed to find out the weight of 3 grams of atoms of sulphur.
So by using this formula we are going to find out weight of atom,
Weight of atom = Atomic mass$ \times $ Given mass
Where, atomic mass = 32 g
And, given mass = 3 g
Therefore by putting the given values in above formula we get,
Weight = $3 \times 32$
Weight = 96 g
Therefore the weight of 3 g atoms of sulphur is 96 g.

So the correct option is (A).

Note: Always keep in mind that, weight of atom=Atomic mass$ \times $ Given mass.
Write and read the units properly. If it is a compound and not an element then its molecular weight is found instead of atomic mass, which is found by the sum of atomic masses of all the atoms present in it.