AQA AS Specimen Paper 1 Q7

Answers available below

14 A sample of pure Mg(NO3)2 was decomposed by heating as shown in the equation below. 2Mg(NO3)2(s) 2MgO(s) + 4NO2(g) + O2(g) A 3.74102 g sample of Mg(NO3)2 was completely decomposed by heating. Calculate the total volume, in cm3, of gas produced at 60.0 C and 100 kPa. Give your answer to the appropriate number of significant figures. The gas constant R = 8.31 J K1 mol1. [5 marks] . 1 0 7 . 2 0 7 Total volume of gas = cm3 The mass of MgO obtained in this experiment is slightly less than that expected from the mass of Mg(NO3)2 used. Suggest one practical reason for this. [1 mark] Barcode Typesetter code<br />

Show answer