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Question 3 [30] 3.1. An organic acid was found to contain only C, H and O. When a 350.0 mg sample of the organic acid was completely combusted in air, 410.5 mg of carbon dioxide and 126.0 mg of water were formed. (12) 3.1.1 Determine the empirical formula of the compound. (10) 3.1.2 Determine the molecular formula of the organic acid if its molar mass is 150.1 g mat'. (2) 3.2 Nitric acid, HNOs, is manufactured by the Ostwald Process in which nitrogen dioxide, NOz reacts with water. NOs(g) + H2O(l) HNOs(ag) + NO(g) 3.2.1 Balance the above equation. (2) 3.2.2 How many grams of NO are required to produce 7.50 g of HNOs? (4) 3.2.3. How many molecules of water are required to produce 1.00 kg of HNO37 (5) 3 CET1XA1 (2023) Paper B 3.3 Consider the following balanced chemical equation for the reaction between iron metal and chiorine to produce Iron chloride. 2Fe(s) + 3Cla(g) + 2FeCla(s) 3.3.1 Calculate the mass of iron required to produce 9.00% iron(lll) chloride in 3.00 L of aqueous solution. The density of the solution is 1.067 g/mL. (?) Question 4 [20] 4.4 Consider the reaction between Fe* and Cr;0;~* below and balance it using the half reaction method Fe* + CnO;* Fe* +Or* (8) 4.2 Determine the Oxidation States of each element in the following reaction: Fe20a(8) +2,Al(s) AlsOs(s) + 2Fe(l) (6) 4.3 Glycerol, CaHpOs, is a substance used extensively in the manufacture of cosmetics, foodstuffs, antifreeze, and plastics. Glycerol is a water-soluble liquid with a density of 1.2656 g.mL? af 15 C. Calculate the molarity of a solution of glycerol made by dissolving 50.0000 mL glycerol at 15 C in enough water to make 250.00 mL of solution. The molecular weight of CaHaOs is 92.094 amu. (6) 4.4 |f Peter prepared a solution by taking 40.0 mL of ethanol and adding enough water to make 240.0 mL of solution. What is the percent by volume of the solution? (2)