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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).
there is no measurable difference between final and initial pH - that is why it is called a buffer E. final pH is 0.16 pH units lower than original pH
How many moles of methane (CH4) gas are in 745 mL at 25.5C and 730 torr?
Sketch the phase diagram of the system NH3/N2H4 given that the two substances do not form a compound with each other, that NH3 freezes at -78°C and N2H4 freezes at +2°C, and that a eutectic is formed when the mole fraction of NH is 0.07 and that t..
Calculate the pH of 23.5 mL of a .165 M aqueous NH3 solution after the addition of 21.7 mL of .100 M HCL. The kb for NH3 is 1.8x10(-5)
Tires in a bike have been filled to a pressure of 53.0 psi at 19.0 deg C. after riding around for a while, the volume of the tire increased by 2% & the temp was now 32 deg C. whats the new pressure in psi
Explain the efffect of temperature on the solubility of gases in liquid? What effect does pressure have on the solubility of gases in liquid( Henry's Law)?
How many electrons could occupy a subshell with the following quantum numbers? A) n=2, l=1 B) n=3, l=1, ml= -1
how many grams of oxygen gas are required to produce 7.68 kj of heat when hydrogen gas burns at constant pressure to
Energy of visible photos and breaking of the bond in AgI, The silver iodine bond energy is approx 255kJ/mol. (AgI is one of the active components in photograpgy sunglasses.)
describe an incident fire spill explosion etc you have experienced or research one on the internet professional journal
What is the concentration of the solution as a mass percentage?
Concentrated sodium hydroxide (NaOH) is 19.4 M, has a density of 1.54 g/mL, and is a strong electrolyte. What is the molality of 19.4 M NaOH? Assume NaOH(aq) dissociates completely to produce two moles of ions per mol NaOH.
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