Chemistry

Given the equation: 2C2H2 + 5O2 4CO2 + 2H2O How many grams of C2H2 are required to react completely with 2. 0 mole of O2?
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Put these atoms in order from most positive overall charge to least positive overall charge.Atom B: 24 protons, 19 electronsAtom A: 14 protons, 16 electronsAtom R: 26 protons, 24 electronsAtom P: 8 protons, 11 electrons PLEASE HELP FAST
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After 45 days a radioactive material has decayed 55. 1%, after an additional 45 days, what percent of the original amount will it have decayed to
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To begin the experiment, 1. 65g of methane CH4 is burned in a bomb calorimeter containing 1000 grams of water. The initial temperature of water is 18. 98oC. The specific heat of water is 4. 184 J/g oC. The heat capacity of the calorimeter is 615 J/ oC. After the reaction the final temperature of the water is 36. 38oC. 5. The total heat absorbed by the water and the calorimeter can be by adding the heat calculated in steps 3 and 4. The amount of heat released by the reaction is equal to the amount of heat absorbed with the negative sign as this is an exothermic reaction. (2pts) a. Using the formula H = - (qcal + qwater ) , calculate the total heat of combustion. Show your work. b. Convert heat of combustion (answer from part a) from joules to kilojoules. Show your work. 6. Evaluate the information contained in this calculation and complete the following sentence: (2pts) This calculation shows that burning _______ grams of methane [TAKES IN] / [GIVES OFF] energy (Choose one). 7. The molar mass of methane is 16. 04 g/mol. Calculate the number of moles of methane burned in the experiment. Show your work. (2pts) 8. What is the experimental molar heat of combustion in KJ/mol? Show your work. (2pts) 9. The accepted value for the heat of combustion of methane is -890 KJ/mol. Explain why the experimental data might differ from the theoretical value in 2-3 complete sentences. (2pts) 10. Given the formula: % error= |(theoretical value - experimental value)/theoretical value)| x 100 Calculate the percent error. Show your work. (2pts)
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A person uses 500kcal of energy to run a race. convert the energy used for the race to the following energy units: joules(j)kilojoules (kj)1 calorie= 4.184 joules
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Based on the equation and the enthalpies of formation shown, what is the AH of the reaction? A.-5335.8 B.-2815.8 C. -580.7 D.580.7
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izWhich sentence from the article shows humans' MAIN problem?(A)(B)(C)(D)Solar radiation is the energy, both heat and light, that the sun gives off.During the day, the sun shines through the atmosphere, causing Earth's surface to warm up.This process is what keeps our Earth at an average global temperature of 14 degrees Celsius (58degrees Fahrenheit).The level of carbon dioxide in Earth's atmosphere has risen consistently for decades, trapping extraheat near the surface of the Earth.
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What is the correct equilibrium expression for the dissociation of the base pyridine: C5H5N + H2O C5H5NH+ + OH-A. Kb = [C5H5NH+][OH-] / [C5H5N]B. Kb = [C5H5N][OH-] / [C5H5NH+][H2O]C. Kb = [C5H5NH+][OH-] / [C5H5N][H2O]D. Kb = [C5H5NH+][C5H5N] / [OH-]E. Kb = [C5H5N][OH-] / [C5H5NH+]
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0. 008 moles of C3H7OH contains how many atoms of carbon?
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Why is the answer a not d?
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Which of these ionization processes requires the highest amount ofenergy?(a) na(g) --> na*(g) + e;(b) mg(g) --> mg (g) + e;(c) al(g) --> alt(g) + e;(d) ca(g) --> ca*(g) + e;
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Determine the celsius temperature of 1.50 moles of ammonia contained in a 10.0-l vessel under apressure of 2.0 atm.a-1100162-50 c0.0 c
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Who was the first person that was to attend to arrange the element in what year
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I need help on number 2 In this lab exercise we tried to predict what would be the limiting reagent in each beakerbased on observation of the amount (in mass) of reactant available. In determining thelimiting reagent in a chemical reaction, is it enough to just know the mass of each of thereactant? Explain.
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Why might your value be different from absolute zero? (HINT: Think errors in the lab. )
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Please help!!!1.00 L of gas is collected in a sealed elastic container in outer space where the pressure is 1.54 x 104 mm Hg and the temperature is 88 K. What will the volume be if the container is moved to sea level ( 101.3 kPa) and room temperature ( 23 C)?
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A mixture of 33. 6 g of Cr(NO3)2 and 60. 5 g of CuSO4 is dissolved in sufficient water to make 98 mL of solution, where the cations react. In the reaction, copper metal is formed and each chromium ion loses one electron. How many electrons are transferred in the balanced net ionic equation with the smallest whole-number coefficients? 1. 5e-2. 2e-3. 7e-4. 4e-5. 1e-(Part 2) What is the molar concentration of SO4^2- anions in the solution? Answer in units of M
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Whichthermochemicalequationcorresponds tothe graph?
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How many grams of O are in 615g of N2O?
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the reaction of nitrogen gas with oxygen gas, , has a kp value of 0.50 at some temperature. if 0.100 atm of n2 and o2 are placed in a closed vessel and allowed to come to equilibrium, what is the approximate equilibrium partial pressure of no gas?
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Will give brainliest no fake answers pleasedetermine the empirical formula of a compound containing 48. 38 grams of carbon, 6. 74 grams of hydrogen, and 53. 5 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 180. 15 g/mol. what is the molecular formula of the compound?for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations
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PLEASE HELP!! WILL GIVE BRAINLIEST!!!Calculate the number of atoms there are in 2. 75 moles of oxygen
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1. when we react 0.600 mol of mg3n2 with 4.00 mol of h20, which is the limitingreactant? mg3n2 (s) + 6 h20 (1) --> 3mg(oh)2 (aq) + 2nh3(g)
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2 Ni(s) + 3 Br2(s)----> 2 NiBr3(s)a. What has been oxidized?b. What has been reducedc. Qhat is the oxidizing agent?d. What is the reducing agent
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