Please give me the key answers without the stepts
17.Calorimetry
18. Increases, exothermic process releases heat.
19. Q = m*c*deltaT
= 50g*0.450J/g°C*25C
= 562.5J = 563J
21. Moles of Mg(NO3)2 = mass/molar mass
Mass = 150g
Molar mass = 148.3g/mol
Moles = 150g/148.3g/mol = 1.01mol
Please give me the key answers without the stepts The measurement of heat flow is called...
How much heat is required to raise the temperature of a 6.69-9 sample of iron (specific heat = 0.450 J/gºC). from 25.0°C to 79.8°C? Select one: O a. 987) ob. 2.95 ) oc. 367) O d. 165 J O e. 815 J In the lab, you mix two solutions (each originally at the same temperature) and the temperature of the resulting solution decreases. Which of the following is true? Select one: O a. The chemical reaction is exothermic. O O...
4. Heat transfer: q = mass x Cs x ΔT and –qreaction = +qsolution a. A piece of metal with a mass of 8.6 g was heated to 100.0°C and dropped into a coffee cup calorimeter containing 402.4 g of water at 25.0°C. If the temperature of the water and the metal at thermal equilibrium is 26.4°C, what is the specific heat of this metal in J/g°C? b. How much heat energy must be added in order to boil a...
C-1 How much heat is required to raise the temperature of 2000 g of water from 50°C to 80°C? The specific heat of water is 4.184 J/g °C a) 110.46 kJ b) 169.45 kJ C ) 251.04 kJ d) 301.25 kJ C-2 An exothermic reaction causes the surroundings to a) warm up b) become acidic c) condense d ) decrease in temperature C-3 Which of the reactions below have a positive entropy change? a) PC13(g) + Cl2(g) PCIs(8) b) NH3(g)...
1. A gas absorbs 0.0 J of heat and then performs 30.8 J of work. The change in internal energy of the gas is a. 61.6 J. b. 30.8 J. c. -61.6 J. d.-30.8 J. e. none of these 2. Which of the following statements correctly describes the signs of q and w for the following exothermic process at P= 1 atm and T = 370 K? H2O(g) → H2O(1) a. q and w are negative. b. is positive, wis...
pleasee show me how to get the correct answers in preperation for my upcoming exam 2.) D 3.) B 4.) D 2) A 5.00-g sample of copper metal at 25.0°C is heated by the addition of 133 J of energy. The final temperature of the copper is °C. The specific heat capacity of copper is 0.38 J/g-K. A) 45.0 B) 25.0 C) 70.0 D) 95.0 E) 35.1 250 3) The value of AE for a system that performs 151 kJ...
Someone please help solving this asap thanks! 1. Calculate AE and determine whether the process is exothermic or endothermic for the following cases: L. When a chemical reaction produces 90.7 kJ of heat but does no work on its surroundings. il. When combustion of a gas releases 2100U of heat to its surroundings. ii. When 33.05 kd of heat is transferred to the system and 22.0 kJ of work on the surroundings. Iv. When 121 kJ of work is performed...
Please help with each one 2. (20 pts.) Calculate the specific heat of a piece of metal if its mass is 25.52 grams and the metal gives off 1551 Joules of heat when cooled to 20 °C from an initial temperature of 85 °C. c.) 0.440J d.) 0.940 J c.) d.) 0.450 g 0.940 J/g °C . (15 pt.) From your Question #5 result, identify the metal using the following table: Metal ΑΙ Fe Hg Bi Cu Pb Specific Heat...
18. In a calorimetry experiment, 0.1277 g af Me ribbon was added to 200.0 mL 0. HCl at 24.12 °C. The water temperature increased to 27.10 °C. Calculate AH for reaction, as performed, and AH per mole of HCI. 19. A 2.50 g sample of sucrose (C2H220) was burned in excess oxygen in a car which contained 2.19 kg of water. The temperature of the water increased from 20. to 25.01 °C. Determine the molar heat of combustion of sucrose....
Home Assignment: Chapter 5: Thermochemistry 12) At what velocity (m/s) must a 20.0 g object be moving in order to possess a kinetic energy of 1.00 )? A) 1.00 B) 100x10 C) 10.0 D) 1.00x10 E) 50.0 13) The value of AE for a system that performs 111 kJ of work on its surroundings and gains 89 kJ of heat A)-111 B)-200 C) 200 D) -22 E) 22 14) The British thermal unit (Btu) is commonly used in engineering applications....
Mail - yitsi almeida - Outlook Q Study 16 Terms Chem 6 Flash * Q Potential and Kinetic Energy Rex m/courses/1093038/quizzes/1706760/take Question 4 x Get Homewe 2 pts Determine the heat required to raise the temperature of a piece of iron(mass = 245 g) that starts at 25.0°C and is heated to 85.0°C. The specificheat capacity of iron is 0.449 J/gºC. SHOW WORK Upload choose a File D Question 5 4 pts A4.98 g sample of phenol (C,H,OH, molar mass...