cameroon gce A level June 2019 chemistry 2
1. (i) What is a molar solution?
(ii) Calculate the mass of Na2S203.5H20 needed to prepare 250 cm3 of a 0.011 M solution in a volumetric flask. (RMM = 248)
(b) Calculate the percentage yield when 2.30 g of ethanol reacts completely with excess ethanoic acid to give 3.52 g of ethyl
ethanoate. (RMM: Ethanol = 46; Ethylethanoate = 88.0)