Tutorial 2

# Tutorial 2 - 4 H 2 O(not balanced Also write the Net ionic...

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CBC 111 Tutorial Questions 2 (1) Under certain conditions, 11 g of A reacts with 22 g of B to give C and 4.5 g of D and there is no starting material left after the reaction. Under the same conditions, 8 g of A and 15 g of B reacts to give D and 0.125 mol of C . Calculate the formula mass of C from these data. (2) A tablet contains 35.0% Fe 2+ and it is used for the supply of iron. The Fe 2+ in the tablet can be slowly oxidized to Fe 3+ when exposed to air. The food authority stipulates that the tablet can no longer be sold when >10% of the Fe 2+ is oxidized. To test whether a tablet has expired, 10.00 g of such a sample was dissolved in dilute H 2 SO 4 to make a 1000 mL solution. A 20.00 mL aliquot was taken out and was titrated using a solution of KMnO 4 containing 0.24 mmol of KMnO 4 . Calculate whether the tablets have expired. FeSO 4 + H 2 SO 4 + KMnO 4 Fe 2 (SO 4 ) 3 + K 2 SO 4 + MnSO
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Unformatted text preview: 4 + H 2 O (not balanced) Also write the Net ionic Equation (3) Solutions of CuSO 4 and 2 equiv NaOH react to give a light blue precipitate Cu(OH) 2 . 0.499 g of Cu(OH) 2 is heated at 1000 o C to give a red solid A that weighs 0.316 g. This red solid A is an oxide of copper. When A is dissolved in H 2 SO 4 solution, another red solid in the elemental form that weighs 0.141 g is obtained. (a) Find out the (empirical) formula of A. Show your result based on calculations. (b) Write all the chemical equations involved. (4) A mixture of Na 2 O, NaOH, and Na 2 CO 3 that weighs 8.0 g only react with 20 g of 36.5% hydrochloric acid. All the solvent was removed after the reaction to give a solid. What is the mass of this solid? (5) Prove that the same mass of O 2 and O 3 contain equal number of oxygen atoms....
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