Question

Let atomic mass of an element be 'A' gram. Then
mass of 10 atoms of element 'A' in amu is

(1) A/10

(2) A/6.023x10²³

(3) 10 A

(4) 10A/6.023x10²³​

Answer 1

Atomic mass of an element = A gram

This means, that one mole of that element weighs A gram

This means that 6.022 × 10²³ atoms of that element weighs A gram

→ This means that one atom of that element weighs A/(6.022 × 10²³)

Hence, 10 atoms of that element would weigh 10A/(6.022 × 10²³)

Hence, option 4) is your answer.

(Given that, one mole = 6.022 × 10²³)

Answer 2

$\mathfrak{\underline{Given:-}}\\\\\text{Atomic mass of an element is `A' gram.}$

$\underline{\mathfrak{To\ find:-}}\\\\\text{The mass of 10 atoms of the element.}$

$\underline{\mathfrak{Solution:-}}\\\\\text{A/q, we get to know that the mass of 1 mole of the element is A gram.}\\\text{Or, number of the atom that weight A gram = 6.023*}10^2^3.$

$\text{Mass of one atom of the element=A/(6.023*}10^2^3)$

$\implies \text{Mass of 10 atoms of the element=10A/6.023*}10^2^3$

∴So, the answer is (4) 10A/6.023x10²³​.