Compound C\mathbf{C}C is a hydrated ionic compound with the empirical formula: CuH6N2O9\text{CuH}_6\text{N}_2\text{O}_9CuH6N2O9.
A student investigates the thermal decomposition of compound C\mathbf{C}C as outlined below.
The student gently heats 0.00400 mol0.00400\text{ mol}0.00400 mol of compound C\mathbf{C}C to remove the water of crystallisation. 0.216 g0.216\text{ g}0.216 g of water is collected, leaving 0.00400 mol0.00400\text{ mol}0.00400 mol of the anhydrous compound D\mathbf{D}D.
The student strongly heats 0.00400 mol0.00400\text{ mol}0.00400 mol of compound D\mathbf{D}D, which decomposes to form a solid oxide E\mathbf{E}E (molar mass of 79.5 g mol−179.5\text{ g mol}^{-1}79.5 g mol−1) and 240 cm3240\text{ cm}^3240 cm3 of a gas mixture, measured at RTP, containing gases F\mathbf{F}F and G\mathbf{G}G.
The student cools the 240 cm3240\text{ cm}^3240 cm3 gas mixture of F\mathbf{F}F and G\mathbf{G}G.
Determine the formulae of C\mathbf{C}C, D\mathbf{D}D, E\mathbf{E}E, F\mathbf{F}F and G\mathbf{G}G.
Show all your working and equations for the reactions.
199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.