Question 30greenspun.com : LUSENET : UR General Chemistry : One Thread |
How exactly do u get the q,w, and dH for question 30
-- Anonymous, March 02, 2000
q = nCpdT(-30to0) + n*dHfusion + nCpdT(0to100) + n*dHvapor + nCpdT(100to140)q = dH at constant pressure
V at 100C = (nRT)/P; V at 140C = (nRT)/P
Vwater= m * density(1g/mol)
work is only done when vaporization occurs and when vapor expands under increasing temp.
w= -PdV(water to gas) - PdV(gas100c to 140C)
-- Anonymous, March 02, 2000