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Copper is obtained from ores containing the minerals, azurite,Cu3(CO3)(OH)2, chalcocite, Cu2S, chalcopyrite CuFeS2,covelite CuS, cuprite Cu2O and malachite Cu2CO3(OH)2 which mineral has the lowest copper content as a percent mass
A sample of gas occupies 7 ml at stp. at what pressure would this sample occupy 500 ml if the pressure was changed to 525 degrees c?
The most common source of copper is the mineral chalcopyrite. How many kilograms of chalcopyrite must be mined to obtain 320. of pure copper?
What volume of 0.25 M HCl solutions must be diluted to prepare 1.00 LK of 0.040 M HCl?
a technician is plating a faucet with chromium. What mass of chromium could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 180 minutes using a constant current of 10.0 amperes
2.00 moles of a gas occupies 62.2 L at a par- ticular temperature and pressure. Its density is 0.900 g/L. What is the molar mass?
the solubility reaction of interest in this solution? (b) Is a precipitate expected in the solution (Yes, No, or Not Enough Information to Know)?
calculate mass of KHC8H4O4 (molar mass = 204.44 g/mol) that reacts with 15 ml of the NaOH solution
110 micro mol of 206^Pb. Assuming that all the 206^Pb comes from decay of the 238^U, estimate the rocks age (in yr).
What is the chemical definition of a buffer solution? Give an example. 2. The Ka of benzoic acid C7H5O2H, IS 6.5X10^-5. What is the buffer range?
Debye-Huckel limiting law to calculate the activity coefficients. Calculate the percentage difference between the a) and b) solubility products for each
the following standard gibbs energy of formation values in kJ/mol: CH4, 50.7; H2O, -228.6; CO2, -394.4 calculate the standard free energy change for the combustion of CH4
What mass of this substance must evaporate in order to freeze 250 of water initially at 25? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
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