q = mass H2O x specific heat H2O x (Tfinal-Tinitial). would convert q in J to q in kJ.
delta H soln in kJ/g = q from above/1.67g
delta H soln in kJ/mol = kJ/g x (146 g/1 mol) = ?
A sample of 1.67 grams of Z is dissolved into 500 grams of water which is in a Styrofoam coffee cup. The temperature is monitored and is found to rise from 25.594◦C to 26.041◦C. What is �Hsolution for substance Z? Assume
no heat is lost/gained by the cup itself. The specific heat of water is 4.184 J/g·◦C and the molecular weight of Z is 146 g/mol.
Answer in units of kJ/mol of Z
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