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A basalitc magma with a 87Sr/86Sr ratio of 0.7025 and a Sr concentration of 300 ppm, a sigma18 O value of 0 passes through a granitic crust with a 87Sr/86Sr ratio of 0.750 and a Sr concentration of 150 ppm and a sigma 18 O of +20. Assuming the oxygen content is analogous in the basalt and granite. The basalt assimilates granite in the proportions of 1%, 2%, and 5% What are the O ans Sr isotopic compositions of the contaminated magmas?
Calculate the molar mass of the earth's atmosphere at an altitude of 500 km where the pressure is 1.6 x 10-11 bar, the temperature is, on average, 1580K and the density is 2.2 x 10-12 g/L
Consider the following reaction for the dissociation of benzoic acid (MW=122 g x mol^-1) in water where Ka for benzoic acid is 6.5 x 10^-5. C6H5COOH(aq) + H2O (l) C6H5COO-(aq) + H30+(aq)
Bond Energies, Using the bond energies below, determine the value and sign of delta H for the
Given the following information A+B-> 2D deltaH=-637.1 KJ deltaS=336.0 J/K C -> D deltaH=544 KJ deltaS=-233.0 J/K calculate ?G° for the following reaction at 298 K. A+B->2C DeltaG=? KJ
Does solubility change with pH? If yes, what is the highest solubility for the following. ( pH=7, pH=6, pH=4) (In other words are the following compounds more soluble in neutral, basic or acidic solutions?) a) NaBr b) Ca(OH)2 c) CaBr2
The addictive painkiller morphine, C17H19NO3, is the principal molecule in the milky jiuce that exudes from unripe poppy seed capsules. Calculate the pH of a 0.0227 M solution of morphine, given that Kb = 7.9E-7.
Calculate the pH of the solution that results when 100.0 mL of 0.15 M NaOH is added to 50.0 mL of 0.25 M HNO3
A mixture of He,Ar, Xe and has a total pressure of 2.60 atm. The partial pressure of He is 0.350 atm, and the partial pressure of Ar is 0.200 atm. What is the partial pressure of Xe
the enzymes used in this experiment are only a partially purified pyruvate kinase preparation. this is because complete
If the barometric pressure is 741 mmHg, and if h = 53. 0 mm, what is the pressure of the gas, expressed in atm and in kilopascals, if the substance in the tube is mercury having a density of 13.6 g/mL.
The sample is titrated to the phenolphthalein endpoint with 15.17 mL of a sodium hydroxide solution. What is the molar concentration of the NaOH solution
Assuming that all of the sulfate and nitrate originated as acids. calculate the expected pH of this rain water.
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