Question

Here is a question:- Mass of the atom Y are:- $\sf ^{146}Y$ and $\sf ^{154}Y$ .They are found in nature : 25% and 75% respectively. Find the Average Relative Molecular weight of the atom Y.

[Note:-Y isn't a symbol of any atom]

Quality answer needed! ​

Answer 1

Question :

Mass of the atom Y are:- $\sf ^{146}Y$ and $\sf ^{154}Y$ .They are found in nature : 25% and 75% respectively. Find the Average Relative Molecular weight of the atom Y

Solution :

Given,

• 146 g and 154 g are isotopes of Y which are found in 25 percent and 75 percent respectively in the nature

To finD :

• The average atomic mass of element Y

Average Atomic Mass is given by :

$\boxed{ \boxed {\sf{ \dfrac{x (percentage) \times x (atomic \: mass)+ y(percentage) \times y(atomic \: mass)}{100} }}}$

Let x be the average atomic mass of the element Y

$\longrightarrow \: \sf{x = \dfrac{(146 \times 25) + (154 \times 75)}{100} } \\ \\ \longrightarrow\: \sf{x = \frac{15200}{100} } \\ \\ \longrightarrow \: \underline{ \boxed{\sf{x = 152 \: g}}}$

Thus,the average atomic mass of Y is 152 g