Using the following information and the fact that the average c―h bond enthalpy is 414 kj/mol, estimate the standard enthalpy of formation of methane (ch4). c(s) → c(g) δh o rxn = 716 kj/mol 2h2(g) → 4h(g) δh o rxn = 872.8 kj/mol

The standard enthalpy of formation of methane is -67.2 kJ/mol.

Explanation:

...[1]

...[2]

...[3]

Since, the bond formation is taking place energy will release that id reaction will be an exothermic reaction

...[4]

Using Hess's law:

[4] = [1] + [2] + [3]

The standard enthalpy of formation of methane is -67.2 kJ/mol.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.