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Grade 11 Stoichiometry help So I'm stuck on this question (I got the answer for the first part of the question, but not the second) and I was wondering if anyone knew how to complete the second part? The chemical formula: 2KCl(aq) + 1Pb(NO3)2(aq) ----> 1PbCl2(s) + 2KNO3(aq) + 215 kJ The question: A 59.0% pure sample of Pb(NO3)2 which has a mass of 6.5g reacts with excess KCl. What mass of KNO3 could I produce? If I run this experiment in a 2.0L vessel, what will be the molar concentration of the resulting KNO3(aq) solution?