I have honestly no idea on how to approach this seemingly easy question, can somebody please provide me with some assistance? I'm adding the enthalpy values up and then entering that as the answer (along with numerous other attempts that have been unsuccessful) and I just don't know where to begin or what to do!!

Use Hess's Law and the thermochemical equations labelled 1 and 2 below, and their standard enthalpy changes of reaction, to calculate the standard enthalpy change of reaction for oxidation of sulphur dioxide to sulphur trioxide, described by equation 3:

1) S8(s) + 8 O2(g) --> 8 SO2(g) -2375 kJ

2) S8(s) + 12 O2(g) 8 SO3(g) -3166 kJ

3) 2 SO2(g) + O2(g) 2 SO3(g) ??? kJ

How do I find the change in enthalpy for reaction 3 by using the above data? If somebody can please show me that would be amazing! Thanks!!