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Determine the age of a rock in years containing exactly twice as much U-238 (t1/2 = 4.5 x 10^9 yr) as Pb-206 by mass. (Assume all the lead came from U-238 decay).
The pH of the HF solution before titrant is added is 1.88 and 43.948 mL of titrant are required to reach the equivalence point.
Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is H for the formation of one mole of Al2O3(s) from the elements.
A mixture of 6.0 mol of H2(g) and 3.0 mol of O2(g) is placed in a sealed evacuated container made of a perfect insulating material at 26 Celcius. The mixture is ignited with a spark and it reacts to form liquid water. Find the temperature of the w..
When one mole of benzene (C6H6) undergoes complete combustion, 3,170 kJ are released. Calculate the combustion energy of 0.350 kg of benzene?
what concentration of aqueous NaCl solution freezes at -15.2 C? the freezing point of pure water is 0.0 C and Kf of pure water is -1.86 C/m.
A gas mixture has three components: N2, F2, and He. their partial pressure are 0.60atm, 0.16atm, and 0.18 atm , respectively. What is the pressure of the gas mixture
How many moles of oxygen gas are required to completely react with 6.20 moles of carbon according to the balanced reaction equation shown below?
at a certain temperature the vapor pressure of pure benzene c6h6 is 0.930 atm. a solution was prepared by dissolving
What percentage error would be introduced in a 35.0 mL sample of liquid if the air bubble comes out of the tip of the buret while the liquid sample is being transferred?
Hind +h2o ind- + h3o+ When a few drops of methyl red are added to 1.0M HCL what is the color of the resulting solution
A lactic acid/lactate ion buffer solution contains 0.31 M HC3H5O3 and 0.90 M C3H5O3- , respectively. The Ka value of lactic acid is 1.4x10^-4 . Calculate the PH of this buffer.
What is the Lewis structure of the covalent compound that contains one nitrogen atom, one hydrogen atom, and one carbon atom? Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
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