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The reactant concentration in a first-order reaction was 6.70×10-2 after 25.0 and 3.30×10-3 after 100 . What is the rate constant for this reaction?
Calculate total and individual w, q, ΔU, ΔH, and ΔS of an Otto engine operating on stoichiometric ethanol - oxygen gas mixture, with cylinder volume of 1 l and compression ratio of 18:1.
The atmospheric pressure in La Grande (683 atmospheric pressure) is significantly lower than that of Portland (760 normal pressure). How would the boiling points of a liquid compare in these two locations? Why?
Compute the mass of Trisodium phosphate required to remove all Ca^2+ ions from 2.50 Litres of the H 2 O sample?
How much heat is produced by the complete combustion of 253g of CH4? Ch4(g) +2 O2(g) ----> CO2(g) + 2H2O (g)
An unknown Cu2+ sample gave an absorbance of 0.262 in an atomic absorption analysis. Then 1.00 ml of solution containing 100.0 ppm Cu2+ was mixed with 95.0 ml of the unknown, and mixture was diluted to 100.0 ml in a volumetric flask.
how many grams of CaCl2 should be dissolved in 500.ml of water to make a 0.20m solution of CaCl2
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to 3.9°C when 4.27 g of the substance is dissolved in the water.
How many grams of methane must be combusted to heat 1.15 of water from 26.0 to 87.0, assuming as a product and 100% efficiency in heat transfer?
A 65 L sample of dry air cools from 133°C to -16°C while the pressure is maintained at 2.85 atm. What is the final volume?
Using the Henderson-Hasselbalch equation determine the pKa for illinic acid from the following values: At pH 9.02, the concentration of illinic acid and its conjugate base
A student wants to conduct an experiment requiring 500 ml of a 3 M sulfuric acid 18 M concentrated sulfuric acid is available. How could the student prepare the desired solution
A 1.0 L solution has a mixture of 0.05 M NaH2PO4 (pKa = 6.86) and 0.10 M Na2HPO4. How much 1.0 M NaOH should be added to bring the solution to pH 7.4?
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