This is not chemistry but it's A, off top.
To calculate the amount of heat transferred when an amount of reactant is decomposed, we must look at the balanced reaction and its corresponding heat of reaction. In this case, we can see that 252.8 kJ of heat is transferred per 2 moles of CH3OH used. When 22 g of CH3OH is used, 86.9 kJ is absorbed.
Out of the choices given, the part of the atom that forms chemical bonds are the outermost electrons. The correct answer is B.
No of protons=107+1=108
No. Of neutrons=158
Mass no. =166
