Question

CHAPTER 9 REVIEW QUESTIONS 1How much heat is required to raise the temperature of a 0.04 kg stainless steel spoon from 20°C to 50°C if the specific heat of stainless steel is 0.50 k/kg-C? 5. An ideal gas is confined to a container whose volume is fixed. If the container holds n moles of gas, by what factor will the pressure increase if the absolute temperature is increased by a factor of 27 (A) 200J (B) 400 J (C) 600 J (D) 800J (E) 1000 (A) 2/(nR) (B) 2 (C) 2nR (D) 2/n (E) 2/R 2. The melting point of copper is 1080°C and its heat of fusion is 200 k]/kg. If a copper coin at this temperature is completely melted by the absorption of 2000 J of heat, what is the mass of the coin? 6. Two large glass containers of equal volume each hold 1 mole of gas. Container 1 is filled with hydrogen gas (2 g/mol), and Container 2 holds helium (4 g/mol). If the pressure of the gas in Container 1 equals the pressure of the gas in Container 2, which of the following is (A) 1/1080 kg (B) 1/540 kg (C) 1/108 kg (D) 1/100 kg (E) 1/50 kg true? (A) The temperature of the gas in Container 1 is lower than the temperature of the gas in Container 2. (B) The temperature of the gas in Container 1 is greater than the temperature of the (C) The value of R for the gas in Container 1 isthe value of R for the gas in Container 2. (D) The rms speed of the gas molecules in Container 1 is lower than the rms speed of the gas molecules in Container 2. 3. Water has the specific heat 4.186 kJ/kg.C, a boiling point of 100°C, and a heat of vaporization of 2260 kJ/kg. A sealed beaker contains 100 g of water that's initially at 20°C. If the water absorbs 100 kJ of heat, what will its final temperature be? in Container 2 gas (A) 100°C (B) 119°C (C) 143°C (D) 183°C (E) 239°C The rms speed of the gas molecules (E) in Container 1 is greater than the rms speed of the gas molecules in Container 2 4. On a cold winter day (5°C), the founda- tion block for a statue is filled with 2.0 m3 of concrete. By how much will the concrete's volume increase on a very warm summer day (35°C) if its coefficient of volume expansion is 4.0 x 10/°C ? (A) 160 cm (B) 1200 cm (C) 1600 cm" (D) 2400 cm" (E) 3200 cm

Answer 1

1 mass m = 0.04kg temperature raise At=500-20c = 30°C specific heat c= 0.5 KJ 1 Kg°C - 500 J/kgoc Heat required a=mc at Q=(0.04) (500) (30) = [60o I