Acompound has an empirical formula of ch2 and a molar mass of 70.15. what is its molecular formula?

From the given empirical formula one needs to calculate the empirical mass just by adding all the atomic masses of each atom in the formula.

Once we have the empirical mass just divide the molar mass with the empirical mass, we will get any one integer like 1,2,3,4,

Multiply the empirical formula with that integer and we get the molecular formula.

Have a look at the pic.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.