The juice from a single lemon fully reacts with $120\,\text{cm}^3$ of $0.50\,\text{mol dm}^{-3}$ sodium carbonate solution. Citric acid has the formula $\text{HOOCCH}_2\text{C(OH)(COOH)CH}_2\text{COOH}$. No sodium carbonate remains unreacted. Assuming citric acid is the only acid present in the sample, what amount of citric acid is contained in one lemon?
- A$0.02\,\text{mol}$
- B$0.04\,\text{mol}$
- C$0.06\,\text{mol}$
- D$0.09\,\text{mol}$