Exp.II Enthalpy of Formation of MgO POSTLAB QUESTIONS I. The background section

Question

Exp.II Enthalpy of Formation of MgO POSTLAB QUESTIONS I. The background section says that while the reaction is taking place and heat is flowing into the solution and calorimeter, heat is also flowing out of the calorimeter to the surroundings. In the reaction of magnesium with acid, calculate the rate of heat loss in minute from the downward slope of the line you drew to extrapolate the falling temperatures back to the time of mixing. 2. What was the T that you used for your calculations for the reaction of magnesium with acid?

Explanation / Answer

a) Assuming the enthalpy of formation of MgO to be delH

At constant pressure,

delH = Q

change in enthalpy of the reaction = heat loss to the suuroundings

m*S*delT = q

where m = mass of MgO formed

s = specific heat capacity of MgO formed

Rate of heat loss to the surroundings = m*S*dT/T

dq/dt = m*s*oC/h

dq/dt = m*s*oC*60/min

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.