Lab 10-Calorimety and the Enthaipies of Neutralization Prelab Questions Pre-lab

Question

Lab 10-Calorimety and the Enthaipies of Neutralization Prelab Questions Pre-lab Questions Name Date Lab Instructor Section Show all your calculations for full credit! . A 50.00 mL sample of distilled water was heated to 62.6 C and was added to 50.00 mL of distilled water at 21.2 °C in an aluminum calorimeter. The maximum temperature, 37.2 °C, of the resulting mixture was determined graphically. Determine the indicated values. Assume the mass of the stir bar was 4.0204 g. Calculations ATH (1 pt) (1 pt) QH (3 pts) (1 pt) (1 pt) (3 pts) CCAL (3 pts) 13 271

Explanation / Answer

dThot = Tfinal - Thot = 37.2 - 62.6-= -25.4 °C

hot mass = 50 mL of water, with approx 1 g/mL then, 50 grams of hot water

Qhot = m*C*dT = 50*4.184*-25.4 = -5313.68 J

dTcool = Tfinal - Tcool = 37.2 - 21.2 = 16°C

mcool =50 g

Qc = -Qhot = 5313.68 J

then

Qcool = Qwater + Qcal = mwater*Cpwater*(dT) + Ccal*dT

5313.68   = 50*4.18*(16) + Ccal*16

Ccal = (5313.68 - 50*4.18*(16) )/16

Ccal = 123.105 J/K

Related Questions

Navigate

• Browse (All)
• Browse L
• Subjects

---

---

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