A student made a sketch of a potential energy diagram to represent an exothermic reaction. Potential Energy (kJ)
Y
Reaction Pathway
Part 1. Describe what X and Y represent on the diagram.
Part 2. Explain how to determine the enthalpy change of a reaction on the diagram.
Part 3. Explain why the diagram made by the student is correct or incorrect.

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

What is the mass of 8 moles of sodium atoms

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?