posted by sam .
if the specifc heat of iron = 0.46J/g C,how much heat is needed to warm 50g of iron from 20C to 100C
-- I do not know how to make the celcius o above the temperature number
Q = Mx(delta)TxC
Q = 1840 Joules
Delta = the triangle I do not know how to make that on the computer
I don't know how to make the delta on the computer either. I usually write as you did. I note that some students use DH for delta H, DT for delta T, DS for delta S, etc.
You answer of 1840 Joules is correct. Good work.
A couple of points I missed. I CAN make the degree sign as 20o C. But it's a lot easier to just write it as 20o C and almost everyone knows what that means. The other point is to please not the correct spelling of Celsius.