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1. Two manufacturing plants need 1.0e4 kg of Al each week. One plant produces the Al from bauxite (Al2O3), whereas the other gets its Al from recycled cans. Given that recovery of recycled Al consumes only 5% of the energy it takes to manufacture Al from bauxite, what is the dollar difference in energy costs for the two plants? For this problem you should only consider the Al energy costs. Assume each company pays $0.04 per kwhr and the ΔHf for Al2O3 is -1676 kj/mole. Finally, you will need this conversion factor: 1 watt-hr = 3600 joules.
A. $163,928.
B. $6902.
C. $6557.
D. $3451.
E. $3279.
2. Over the course of a month, a family used 100 gallons of hot water per day. What is this families monthly expenses for water heating? For this problem assume that a month has 30 days, the price of electricity is $0.06 per kwhr, the heat capacity of water is 4.18 J/C*gram, that the water is heated from 20 to 70 C and that the water heater is 100% efficient. You can use the conversion factor from the problem above and you may need to look up other conversion factors.
A. $9.50
B. $22.06
C. $39.71
D. $158.33
E. $661.83
The combustion of 135 mg of a hydrocarbon produces 440mg of CO2 and 135 mg of H2O. The molar mass of the hydrocarbon is 270 g/mol.
What is w when a gas is compressed from 38.3 L to 28.8 L using a constant external pressure of 745 mmHg? (Remember to include a "+" or "-" sign as appropriate.)
Is the melting of wax a physical or chemical change? from the mass measurement only,( the mass of the candle at 0 minute is 10.1g, after 30 minutes is 7.4g) how could a chemical also be proved to have occured in the burning of candle.
The amount (N = grams) of radioactive material present in a sample as a function of time is given by the following equation, where No is the amount present at t = 0. : N (t) = No e^-kt At Great Basin College, we have a specimen of a highly radioac..
Write a balanced equation with phase changes for an electrochemical cell that has a copper cathode immersed in a solution of cu+2 ions and a lead anode immersed in a solution of Pb+2 ions
gaseous CO2 can react with H2O and affect the pH of the solution. Write the balanced chemical reaction that occurs. Use this reaction to describe why solutions of distilled water will test slightly acidic.
Using the henderson hasselbach equation if [H+] =1.55x10^-4 and the ratio [A-]/[HA] = 0.52, what is the Ka of the solution? Is this consided to be a strong or weak acid?
what mass of sucrose should be combined with 478 of water to make a solution with an osmotic pressure of 8.60 at 320 ?
The first order reaction SO2CL2 yields SO2+ Cl2 is 10% complete in 80 min. How long would it take for the reaction to be 95% complete?
Although the mechanism of the coupling process is not well understood, it is known that ratre appears to depend on the square of the concentration of the halide.
Use the information given to determine the ?Hof of NO(g) in the reaction below. 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) ?Horxn = -902.0 kJ (NH3(g) ?Hof = -45.9 kJ/mol; H2O(g) ?Hof = -241.8 kJ/mol)
Find the entropy change of the system and of the surroundings if 3.000mole of water freezes reversibly at 1.000atm. the freezing temperature is 0.00C at this pressure, and the specific enthalpy change of fusion is equal to 79.7cal/gm at this tempe..
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