Q=mc(delta)T
118=0.005×c×15
c=118/(0.005×15)
c= 1573 J/kg/C
Caffeine is a fixed molecule. It is a compound.
D. There is one atom of sulfur and three atoms of oxygen.
The "tri" in trioxide indicates three so there are three atoms of oxygen. As nothing is said about the sulfur, there is just one atom.
Hope this helps!!