apling Learning acmillan laarming mple of a substance is itially at 22.8 After a

Question

apling Learning acmillan laarming mple of a substance is itially at 22.8 After absorbi 2165 J of heat, the temperature of the s is 136.6 , what is the specific heat (c) of the substance? Number rsity Science Books When 1427 J of heat energy is added to 39.3 g of ethanol, CaHeo, the temperature increases by 14 8 C Calculate the molar heat capacity of CaHO. Number Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 2.60 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase bymore than 10.0 ? Use -30.8 JOK-mol) for Na@ at 500 K. Number

Explanation / Answer

Q1.

m = 39.29 g of substance

Ti = 22.8°C

Q = 2165 J

Ti = 136.6°C

find C

Q = m*C*(TF-Ti)

C = Q/(m*(Tf-Ti))

C = 2165 / (39.29*(136.6-22.8))

C = 0.484209 J/gC

Q2.

m = 1477 J

m = 39.3 g of ethanol

Ti = 14.8°C; find C

Q = m*C*(Tf-Ti)

C = Q / (m*C*(Tf-Ti))

C = 1427/(39.3*(14.8))

C = 2.4534 J/gC

Q3.

find mass of sodium:

Q = 2.6 MJ = 2.6*10^6 J

dT = 10°C

Cp = 30.8 J/molK --> 30.8 /23 = 1.33913 J/gC

Q = m*C*(Tf-Ti)

m = Q/(C*(Tf-Ti))

m = (2.6*10^6) / (1.33913 * 10))

m = 194155.9 g of Na

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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