q = mCT
m = 74.5 g
C = 4.18 J/g0C
T = 86.4 - 4.7 = 81.7
q = 74.5 x 4.18 x 81.7
q = 25442.2 J
answer = 25442.2 J
Part C the energy lost when 74.5 g of water cools from 86.4 C to 4.7...
joules lost when 78.1 g of water cools from 86.4∘C to 3.6 ∘C
Part A Find the excitation energy from the ground level to the third excited level for an electron confined to a box that has a width of 0.127 nm ΔΕ : SubmitP X Incorrect; Try Again; 5 attempts remaining Part B The electron makes a transition from the n-1 to n-4 level by absorbing a photon. Calculate the wavelength of this photon SubmitPr Previous Answers Request Answer
what is the total energy in MeV, of ( previous answers of 453.27 for part 1, and 0.247 for part two were incorrect) A proton traveling at 98.3 % of the speed of light? ΠΙ ΑΣφ. ? Ер MeV O You have already submitted this answer. Enter a new answer. No credit lost. Try again. An electron traveling at 98.3 % of the speed of light? IVO AXO ? E = 0.247 MeV Submit Previous Answers Request Answer X Incorrect;...
2. Calculate the heat (in calories) lost by 115 g of water as it cools from 91.4 °C to 15.4 °C.
Calculate energy in joules and calories, when 15.0g of ethanol is lost, C2H6O,cools from 60.5 to 42.0 ,Ethanol has 0.588cal/g degree Celsius and 2.46j/g degree Celsius
▼ Part A What is the period of a simple pendulum 70 cm long on the Earth? Express your answer using two significant figures. If there is no answer, enter none. SubmitP Previous Answers Request Answer X Incorrect: Try Again; 2 attempts remaining Part B at is the period of a simple pendulum 80 <cm long when it is in a freely falling elevator? Express your answer using two significant tigures. It there is no answer, enter none.
Review Periodic Table Constants Part A A coffee-cup calorimeter contains 130.0 g of water at 25.3 C.A 122.0-g block of copper metal is Determine the amount of heat, n J, lost by the copper block. 100 4°C by putting it in a beaker of Cu(s) is 0.385 heated boiling water The specific heat J/g K. The Cu is added to the calorimeter, and after a time the contents of the cup reach a constant temperature of 30.2 ΠνΠ ΑΣφ. ?...
Part A What wil be the equilbrium temperature when a 275 g block of copper at 255 Cis placed in a 155 g aluminum calonmeter cup containing 855 g of water at 14.0 C Express your answer using three significant figures. ? T6,84 C Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Provide Feedback Next > The value of specific heat for copper is 390 J/kg C, for aluminun is 900 J/kg C, and for water...
When heated to 350 °C at 0.950 atm, ammonium nitrate decomposes to produce nitrogen, water, and oxygen gases: 2NH, NO3(s) —2N2 (9)+41, 0(9)+02 (9) , Part A How many liters of water vapor are produced when 22.6 g of NH, NO, decomposes? Express your answer with the appropriate units. HÅR OO? Value Units V: Submit Previous Answers Request Answer * Incorrect: Try Again: 4 attempts remaining X Incorrect; Try Again; 4 attempts remaining Part B How many grams of NH,...
need A & C Part A Calculate the volume of 1.32 mol of liquid water at a temperature of 20 °C (at which its density is 998 kg/m?) Express your answer in meters cubed. 10 AED O ? 24.11 Submit Previous Answers Request Answer * Incorrect; Try Again: 4 attempts remaining Part B Calculate the volume occupied by 1 32 mol of steam at 200 "C. Assume the steam is at atmospheric pressure and can be treated as an ideal...