Chemistry · May / June 2026 · Paper 12 · Question 7

An ionic compound contains only three elements, X, Y and Z. The compound has a ratio of one atom of X to one atom of Y to three atoms of Z. The average mass of the isotopes of element X is twice the mass of an atom of $^{12}_{6}\text{C}$. The average mass of the isotopes of element Y is equal to the mass of an atom of $^{12}_{6}\text{C}$. The relative atomic mass of Z is $\frac{4}{3}$ times the relative atomic mass of Y. What is the relative formula mass of the compound?

1. A26
2. B42
3. C52
4. D84

As printed in the paper