do locators assignmer onLocators ass C Search Use the References to access inpor

Question

do locators assignmer onLocators ass C Search Use the References to access inportant values if needed for this question The following information is given for aluminum at 1atm 2467.00 Tm- 660.00°c Specific heat solid 0.9000 J/g °C Specific heat liquid-1.088 J/g °C A,ap(2467.00°C)= 1.053 × 104 J/g AH (660.00°c) 398.4 J/g A 24.10 g sample of liquid aluminum at 923.00°C is poured into a mold and allowed to cool to 25.00°C. How many kJ of energy are released in this process? (Report the answer as a positive number) Energy kJ Submit Answer Retry Entire Group 8 more group attempts remaining

Explanation / Answer

aluminium goes from liquid at 923°C, to solid 25°C

then

923 --> 660 (liquid, sensible heat)

660 --> freezing of aluminium

660 --> 25°C (solid, sensible heat

thjen

Q1 = mass * Cpliquid* (Tm-Ti)

Q2 = mass * Latent heat of freezing

Q3 = mass * Cpsolid (Tf-Tm)

substitute:

Q1 = 24.10* 1.088* (660-923)

Q2 = 24.10* -398.4

Q3 = 24.10* 0.9*(25-660)

Qtotal = 24.10* 1.088* (660-923) + 24.10* -398.4 + 24.10* 0.9*(25-660)

Qtotal = -30270.66 J

we must apply

Qrequired = 30.27 kJ

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

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