Nov 2012 [32] Q (2) 2 chem
The diagram shows a heating curve for a sample of compound X. F 80 E temperature/C 2 00 15 с S A time (a) Is X a solid, a liquid or a gas at room temperature, 20 °C? ...liquid... [1] (b) Write an equation for the equilibrium which exists in region BC. [2] (c) Name the change of state which occurs in region DE. [1] (d) Explain how the curve shows that a pure sample of compound X was used. * [2]​

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.