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- deltaHorxn = -7.83 kJ mol-1 K, was measured to be 2.6 × 104 at 150K. what is Temperature(Kelvin) at which K = 1.3 × 103.Hydrogen thiosulfite, HS2O2-, is a weak acid with pka= 6.97. A.) There are two sulfur atoms in HS2O2-. What are the oxidation states of the S1 sulfur and S2 sulfur. See picture attached. B.) A solution is made from 0.50 moles of NaHS2O2 dissolved in 2.0 L of 0.20M NaOH. What is the ph of the resulting solution at 298 K?A 0.6599-g sample of impure magnesite, MgCO3 (MW = 84 g/mole), was decomposed with HCl; the liberated CO2 (MW = 44 g/mole) was collected on absorbent and found to weigh 0.1673-g. Calculate the percentage of magnesium (MW = 24 g/mole) in the sample. MgCO3 (s) + 2 HCl (aq) →MgCl2 (aq) + CO2 (g) + H2O(l) Weight of pure magnesium in the sample is a. 0.1825 g b. 0.0913 g c. 0.3194 g d. 0.0456 g Percentage of magnesium carbonate in the sample is a. 24.20% b. 27.66% c. 48.40% d. 96.80%
- The iron content of a municipal water supply was determined by an atomicabsorption procedure. The absorbance of the water, after a five-fold dilution, was0.755 at 248.3 nm. A standard solution, prepared by dissolving 0.2018 g of pureiron wire in acid, diluting to 250.0 mL, and then making a 100-fold dilution, hadan absorbance of 1.015. Calculate the ppm Fe in the water sampleWrite a short note on biologicalrelevanceof sodiumand calciumA student determined the chloride content of a commercial salt by using the Mohr method. A 0.7725 -g sample of the salt was dissolved in distilled water and diluted to a final volume of 250. mL. A 25.-mL aliquot of the analyte solution was then titrated against a standard 0.0347 M AgNO3(aq) solution to the chromate end-point. A blank-corrected volume of 25.96 mL was recorded. Calculate the percent chloride in the sample.
- A student determined the chloride content of a commercial salt by using the Mohr method. A 0.7725 -g sample of the salt was dissolved in distilled water and diluted to a final volume of 250. mL. A 25.-mL aliquot of the analyte solution was then titrated against a standard 0.0347 M AgNO3(aq) solution to the chromate end-point. A blank-corrected volume of 25.96 mL was recorded. Calculate the percent chloride in the sample. Provide your answer to two decimal places and without units.Ammonium iron(II) sulfate crystals have the following formula: (NH4)2SO4.FeSO4.nH2O . In an experiment to determine n 8.492g of the salt were dissolved and made up to 250cm^-3 of solution with distilled water and sulphuric acid. A 25.0cm^-3 portion of the solution was titrated against 0.0150 mol dm^-3 KMnO4. A volume of 22.5cm^-3 was required. Find the value of nWhat does the Nernst equation allow?
- Calculate the standard potential E0 for the process Ni(CN)42- + 2e- ⇄ Ni(s) + 4CN- given that the formation constant for the complex is 1.0x1022Given that the ratio between U235 and Pb207 analyzed from the igneous intrusion (K) is 1:3 and half-life of the dating method is 713 million years. How old is the granite? Explain your answerThe first stage in corrosion of iron upon exposure to air is oxidation to Fe2+. (a) Write a balanced chemical equation to show the reaction of iron with oxygen and protons from acid rain.