The shell of a chicken’s egg contributes $5\%$ of the mass of an average egg. The mass of an average egg is $50\text{ g}$. If the egg shell is taken to be pure calcium carbonate, how many complete chicken’s egg shells are needed to neutralise $50\text{ cm}^3$ of $2.0\text{ mol dm}^{-3}$ ethanoic acid?
- A$1$
- B$2$
- C$3$
- D$4$