Question

The relative atomic mass of X is twice the mass of beryllium whereas that of Y is thrice the mass of beryllium. Choose the correct statements regarding X and Y.

• A. Y is 4 times heavier than $\frac{1}{12}$ of carbon atom.​
• B. X is 18 times heavier than $\frac{1}{12}$ of carbon atom.​
• C. Y is 20 times heavier than $\frac{1}{12}$ of carbon atom.​
• D. X is 9 times heavier than $\frac{1}{12}$ of carbon atom.​

Answer 1

The correct option is B X is 18 times heavier than $\frac{1}{12}$ of carbon atom.​

Relative atomic mass of Be = 9 u.
Relative atomic mass of X = 18 u.
Thus, X is 18 times heavier than $\frac{1}{12}$ of carbon atom.​
Relative atomic mass of Y = 27 u.
Thus, Y is 27 times heavier than $\frac{1}{12}$ of carbon atom.​