A student made a sketch of a potential energy diagram to representing endothermic reaction . Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the value of x and y represent

that graph is incorrect

Explanation:

The total potential energy of the system increases for an endothermic reaction as the system absorbs energy from the surroundings. The graph being shown represents a exothermic reaction because the total potential energy decreases at the end. In this graph, the x represents the reactants and the y represents the products. For an endothermic reaction, the y should represent the reactant and the x should represent the products. Just put that into complete sentence and you should be good. If you have any question, ask.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"