I am doing lab on doughnuts and calories.Experimentally we had to find the number of calories.(delta H)

My mass of water was 100g

delta t of water= 25-23=2

my mass of dougnut before was:6.24

and my after mass was 1.84

therefore delta m= -4.4

I started by finding the Q of water(Q=mc delta t )

which gave me 838 joules

which is 0.838 Kj

now i need to find delta h

the only formula i can think of to solve the question is

Qwater/delta M = delta H/molar mass

I know Qwater and delta m.But i have no molar mass.so i cant find delta H.

I need to find my Delta h and i cant think of how since i have 2 variables.Is there another way of finding delta h.Please help me out cuz like im stuck on this thing for an hour trying how to find delta h but i just cant find a way

thanx so much

pat