Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –

Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Suppose that the molar enthalpy of a reaction is -240 kJ/mol and 44.0 grams of X (MW = 14) reacted. How many joules of heat are released by the reaction? Report your answer to the appropriate number of significant figures in the first blank below and the correct units in the second blank below.
thermometer A sample of aluminum, which has a specific heat capacity of 0.897 Jg contains 150.0 g of water. The aluminum sample starts off at 90.9 °C and the temperature of the water starts off at 15.0 °C. When the temperature of the water stops changing it's 20.4 C. The pressure remains constant at 1 atm. "C is put into a calorimeter (soe skotch at right) that Insulated container water Calculate the mass of the aluminum sample. Be sure your answer is rounded to 2 significant digits. sample a calorimeter
O THERMOCHEMISTRY Using specific heat capacity to find temperature change A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 7.80 kg of water at 23.4 °C. During the reaction 106. kJ of heat flows out of the bath and into the flask. -1 Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J'g ''K '. Be sure your answer has the correct number of significant digits. ?
O THERMOCHEMISTRY 15 Using Hess's Law to calculate net reaction enthalpy Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. In the first step, nitrogen and hydrogen react to form ammonia: N,(9) + 3 H,(g) → 2 NH;(9) AH=-92. kJ In the second step, ammonia and oxygen react to form nitric acid and water: NH,(g) + 20,(g) → HNO3(g) + H,0(g) AH=-330. kJ Calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. Round your answer to the nearest kJ.
For 6.60 g of a substance initially at 14.5*C with a heat capacity of 0.400 J/g*C, what will be its final temperature if q = -51.9 J
Pls pls pls solve this accurate
30
When 1.60 g of liquid PCI3 at 23.9 C is added to a solution of water at in a coffee cup calorimeter, the temperature of the solution increases to 43.8C. If the heat capacity of the solution and calorimeter is 421.7 J/C, calculate the molar heat of the PCI3. Answer to 0 decimal places in kJ/mol. Your Answer: Answer
4) A 154.11 gtsample of concrete, with a specific heat capacity of 0.88 J/(g*•C), initially has a temperature of 22.4 °C. If 841.50 J of energy is released from the sample: a) Determine the change in temperature, in oC (do not round). [A3] b) Determine the anticipated final temperature, in C (round to 2 decimal places). [A2]
References Use the References to access important values if needed for this question. When N2(g) react with O2(g) to form N,0(g) according to the following equation, energy is absorbed from the surroundings. 2N2(g) + O2(g) 2N2O(g) Is this reaction endothermic or exothermic? What is the sign of AH for the reaction? Would the energy of the surroundings increase or decrease as a result of this process? Submit Answer alpy and Representing Energy Change: This is group attempt 2 of 5 Regenerate C Autosaved at 4:41 PM hp
Match this 2 questions with the correct answers
When 1.06 g of liquid PCI3 at 15.5 C is added to a solution of water at in a coffee cup calorimeter, the temperature of the solution increases to 31.5C. If the heat capacity of the solution and calorimeter is 421.7 J/C, calculate the molar heat of the PCI3. Answer to 0 decimal places in kJ/mol. Your Answer: Answer