a .1326 gram sample of magnesium was burned in an oxygen bombcalorimeter. The to

Question

a .1326 gram sample of magnesium was burned in an oxygen bombcalorimeter. The total heat capacity of the calorimeter plus waterwas 5760 J/C. If the temperature rise of the calorimeter with waterwas .570 degrees C, calculate the enthalpy of combustion ofmagnesium. Mg+1/2 O2 produces MgO a .1326 gram sample of magnesium was burned in an oxygen bombcalorimeter. The total heat capacity of the calorimeter plus waterwas 5760 J/C. If the temperature rise of the calorimeter with waterwas .570 degrees C, calculate the enthalpy of combustion ofmagnesium. Mg+1/2 O2 produces MgO

Explanation / Answer

We Know that :      The Reaction is :          Mg + 1/2 O2 ------> MgO         According to theprinciple of Thermodynamics :           Q = m x s x t                 = 5670 J / C x 0.570 0C                  = 3231.9 J for the combustion of 1 mol of combustion of Mg           Thenumber of moles of Mg taken = 0.1326 g/ 24 g / mol                                                                        = 0.00525 mol              The Enthalpy of the combustion for 0.00525 molof Mg is 17.856 J / mol

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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