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A rock sample contains traces of 238U, 235U, 232Th, 208Pb, 207Pb, and 206Pb. Careful analysis shows that the ratio of the amount of 238U to 206Pb is 1.164. (a) Assume that the rock originally contained no lead, and determine the age of the rock. (b) What should be the ratios of 235U to 207Pb and of 232Th to 208Pb so that they would yield the same age for the rock? The half-lives of the isotopes are 4.47 × 109 yr for 238U, 7.04 ×108 yr for 238U, and 1.41 × 1010 yr for 232Th. allowed formula N(t)=N(0)(0.5)^t/t(1/2)
The gas phase irreversible first-order reaction A----> 3B , is carried out in PFR where the feed is equal molar in A and inerts. the conversion under these circumstances is 50%.
At 25C, H2O2 decomposes according to the following equation. 2H2O2(aq) => 2H2O (l) + O2(g) .55V
Assume that patient blood lead levels are 0.600 mg/L that total blood volume is 5.0 L and that 1 mol of succimer binds 1 mol of lead.
Compute the pH at the temperature of 25 0C of a solution prepared by mixing 50 mL of 1.60 M sodium hydroxide solution to 0.5 of .0850 M Furoic acid HC 5 H 3 O 3 .
Calculate the overall energy change (in kilojoules per mole) for the formation of Csf from its elements using the following data.
The density of a liquid sulfur compound is 1.14 gmL1. This compound contains 23.7% sulfur. How many milliliters of the compound must be burned to obtain 6.40 g of SO2? Molar Mass SO2 64.1 gmol
in the reaction P4+5O2->2P2O5, how many moles of oxygen are consumed each time 0.500 mole of P2O5 is formed?
Determine how much time (in seconds) is needed to form 150. g Na from a sodium chloride melt by a 25 Ampere current?
What will be the average atomic mass of element A if percentage abundance of these two isotopes are 48.17 % and 51.83 % respectively. ?
Fish are processed into Fish meal and used as a supplemen- tary protein food. In the processing the oil is First extracted to produce wet Fish cake containing 80 wt % water and 20 wt % bone-dry cake
A volume of 20.22 mL of NaOH solution which is (0.046464) was needed to titrate 10.06mL of acetic acid to the phenolphthalein end point.
A 0.500 L solution of 7.50 M hydrochloric acid is used to neutralize a 250.0 g sample of calcium hydroxide. Calcium chloride - a chemical used to control highway dust, strengthen concrete mixes, and add flavor to foods - is produced by the reactio..
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