Write the mass-action expression, Qc, for the following chemical reaction equations: 15 1) CaCO3(s) <-> CaO(s) + CO2(g) 2) CH4(g) + 202(g) <-> CO2(g) + 2H20(1) 3) AgCI(s) Ag* (aq) + Cl" く-> (aq) 4) Zn(s) + Cu2*(aq) Zn2+ <-> (aq) + Cu(s)
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- What is ΔSsurr for a reaction at 28.6 °C with ΔHsys = 38.9 kJ mol-1 ? Express your answer in J mol-1 K-1 to at least two significant figures.A water contains 50.40 mg · L−1 as CaCO3 of carbon dioxide, 190.00 mg · L−1 as CaCO3 of Ca2+ and 55.00 mg · L−1 as CaCO3 of Mg2+. All of the hardness is carbonate hardness. Using the stoichiometry of the lime soda ash softening equations, what is the daily sludge production (in dry weight, kg · day−1) if the plant treats water at a rate of 2.935 m3 · s−1? Assume that the effluent water contains no carbon dioxide, 30.0 mg · L−1 as CaCO3 of Ca2+ and 10.0 mg · L−1 as CaCO3 of Mg2+. Be sure to calculate the mass of CaCO3 and Mg(OH)2 sludge produced each day.A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points.
- What is the actual or real-life application of precipitation gravimetric analysis? Include the specific methodology.What application of CHNS elemental analysers can be suggested in Food Analysis Give examples for it and explain its importance4.Discussed the Purposed of the Golden rules in the practice of Forensic Chrmistry.
- A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points. 7.24 ± 0.74% 7.24 ± 0.13% 7.24 ± 0.42% 7.24 ± 0.27%Was the gradual color change observed when the sodium thiosulfate (Na2S2O3) crystal was added to the aqueous solution of KI/12 in Station Cevidence of a chemical or physical change?A wet pipette was used to transfer 10.00 mL of 1M HNO3 in the determination of ΔHrxn. [magnitude of ΔHrxn] In a maximum of 3 sentences explain why ΔHrxn decreases.
- 2 what is the purpose of BSC Level 1 & 2, proper layout, performance, and its application in biosafety assessmentwhy would you write 13.90 when only two sig figs were given? Where does the extra "precision" come from?Using the kinetic data pictured, estimate Vmax and Km for the catalysis of Substrate 1 by the following enzyme (using the correct units).