Why does energy need to be inputted for an endothermic reaction? A)Energy is needed to form bonds
B)Energy is not needed to form or break bonds
C)Energy has nothing to do with making or breaking bonds
D)Energy needs to be inputted to break bonds

Define dew point. i am writing this part to be able to ask the question

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.