Question:

Two/three or more component system: practice the algebra! INCLUDE ALL UNITS! 3. A sample of a metal with a mass of 212g is heated to 125.0°C and then dropped into 375g of water at 24.0°C. If the final temperature of the water is 34.2°C, what is the specific heat of the metal? (Hint: treat as 2-component system) 1pt work space: 4 water at 18.3°C. If the temperature of the water rose to 20.4°C, what is the specific heat of the metal? (Hint: treat as 2-component system) 1pt work space: A piece of metal with a mass of 19.0g is heated to 87.4°C and then placed in 55.5g of A 325.0g piece of gold at 427°C is dropped into 200.0mL of water at 22.0°C. Calculater 5 the final temperature of the mixture. Specific Heat of gold 0.131Jg°C. 1pt work space:
A Colfee cup calorimeter contains 480.0g of water at 25.00 C. To it are added: 380.0g 6. of water at 53.5°C and 525.0g of water at 65.5°C. Calculate the expected final temperature of the mixture. (Hint: treat as 3-component system) 1pt work space: At 6.00pm, you put a 300.0g copper pan (specific heat Cu 0.385J/g°C ) containing 7 800.0mL of water (all at 25.0°C) on the stove. The stove supplies 628J/s. a. How long will it take in seconds for the water to reach boiling? b. At approximately what time does the water first begin to boil? (Hint: calculate q for the water and the pan) Remember density! (Please provide answer in the form 1:05pm and 15 sec or 9:30am and 25 sec-must include am/pm and seconds in answer b). 2pts work space: a) b)
AH and Calorimetry: Suppose 33mL of 1.20M HCI is added to 42mL of a solution containing excess sodiumm hydroxide in a coffee-cup calorimeter. The solution temperature, originally at 25.0°C, rises to 8. 31.8°C. COMPARE ANSWER WITH PROBLEM  9. 2pts Provide a thermochemical equation, including AH in kJ. (include sign) -What is the energy (AH) evolved in kJ per mole of HCI? (include sign) For simplicity, assume the heat capacity and the density of the final solution are those of H2O. (Note: in more accurate work, these values are not the same and must be calculated). Also assume that the total volume of the solution equals the sum of the volumes of HCI(aq) and NaOH(aq). work space Provide a thermochemical equation. а. b. a) Must include sign b) (Basically the same reaction as  8 above, without some of the assumptions) In one experiment, a student placed 50.0mL of 1.00M HCI at 25.5°C in a coffee-cup calorimeter. To this was added 50.0mL of 1.00M NaOH solution also at 25.5°C. The mixture was stirred, and the temperature quickly increased to a maximum of 32.2°C. 2pts Provide a thermochemical reaction, including AH in kJ. (include sign) What is the energy (AH) evolved in kJ per mole of HCI? (include sign) Because the solutions are relatively dilute, we can assume their specific heats are close to that of H O, 4.184J91°C. However, do not assume the density of the solutions is that of water. The density of 1.0OM HCI is 1.20g/mL and 1.00M NaOH is 1.40g/mL. 9 a b. Work space: Provide a thermochemical equation.
Must include sign b) A reaction known to release 1.78KJ of heat takes place in a calorimeter containing 10. 0.100L of solution and the temperature rose by 3.65°C. The calorimeter was then rinsed out and emptied. To the empty calorimeter was placed a small piece of calcium carbonate and 0.100L of dilute HCI was poured over it (in the same calorimeter). The temperature of the calorimeter then rose by 3.57°C. Remember to include the correct sign in your answer. 1pt What is the heat, q. in kJ released by the reaction? Must include sign Remamber to include anits for all problems. Remember to use the correct number of significant figures and include the "sign" in your answers. TOTAL SCORE DONE! /13

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