MISSED THIS? Read Section 6.6 (Pages 228-235); Watch KCV 6.6, IWE 6.10. A gas mixture contains 1.29 g N₂ and 0.76 g O₂ in a 1.64-L container at 15 °C. Mother to Son &....pdf A Part A Calculate the mole fraction of N₂. Express your answer to three significant figures. XN₂ = Submit ▾ Part B X₂ = 195] ΑΣΦ Submit Request Answer Calculate the mole fraction of O₂. Express your answer using two significant figures. 1951 ΑΣΦ → Request Answer ?
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- A sample of potassium permaganate (KMnO4) reacts to completion with sodium oxalate (Na2C2O4) in the folowing redox reaction: 2MnO4- (aq) + 5C2O4-2 (aq) + 16H+ (aq) --> 10CO2 g) + 2Mn+2 (aq) + 8H2O (l) The volume of carbon dixoide released by the reaction at 297 K and 1.00 atm was 138 L. How many moles of potassium permanganate reacted? The Universal Gas Constant is 0.082057 L x atm/ mol x K. (answer in sig figs)1. A student following the procedure described in this module collected the following data: mass Mg, g 0.0243 initial syringe volume, mL 1.0 final syringe volume, mL 26.5 barometric pressure, torr 754 temperature, K 298 (a) calculate the gas law constant (b) What would be the volume of hydrogen gas produced by the reaction of 0.243 g of magnesium metal and collected at 750 torr and 298 K? Use the value for R found in part 1.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.
- 1. A student following the procedure described in this module collected the following data: mass Mg, g 0.0243 initial syringe volume, mL 1.0 final syringe volume, mL 26.5 barometric pressure, torr 754 temperature, K 298 Determination#1 The value of the gas law constant (R) is 0.0822 L.atm/mol.K Determination #2 he volume of hydrogen gas produced by the reaction of 0.243 g of magnesium metal and collected at 750 torr and 298 K = 248 mL The results of this experiment are greatly affected by the care with which each of the steps is completed (a) Describe the error that would occur if the magnesium were to slide into the HCl in the test tub before the system is sealed off (b) What would be the effect on the results of a rise in the room temperature from 22.0 celcius, when determination #1 was done, to 25.3 celcius, when determination #2 was made? (c) Why must the surface coating of MgO be removed prior to determining the mass of magnesium used in the experiment? (d) What would be the…DESCRIBE THE PROCEDURE OF d) 600 mL of 3.00% (w/v) aqueous BaCl2from a 0.400 M BaCl2solution. (e) 2.00 L of 0.120 M HClO4from the commercial reagent [71.0% HClO4(w/w), specificgravity1.67]. (f) 9.00 L of a solution that is 60.0 ppm in Na+, starting with solid Na2SO4Nickel carbonyl, Ni(CO)4, is one of the most toxic substancesknown. The present maximum allowable concentrationin laboratory air during an 8-hr workday is 1 ppb(parts per billion) by volume, which means that there isone mole of Ni(CO)4 for every 109 moles of gas. Assume24 °C and 1.00 atm pressure. What mass of Ni(CO)4 is allowablein a laboratory room that is 12 ft x 20 ft x 9 ft?
- A sample of an iron ore was prepared for Fe3+ analysis as following: 3.4g of the sample was added anddissolved in acid environment then diluted to 250 mL using volumetric flask. After that, 10 mL of the resultingsolution was transferred by pipet to a 50-mL volumetric flask and continue to be diluted. The scientists foundout that this solution gives the concentration of Fe3+ as 2.3 mg/L. Find the weight percentage of Fe3+ in theoriginal sample.1. "Band structure" of "Hatom chain" and "H mole chain" are drawn as "graphs" and "intermediate process". Describe it in detail.sodium azide (Na3N) decomposes on heating to form sodium and nitrogen gas. 2Na3N--> 6Na+N2 1.35g of sodium nitride were heated. a) calculate the mass of sodium formed on complete decomposition of the sodium nitride. give your answer to 3 significant figures.(AO2) b)calculate the volume of nitrogen gas (in cm^3)produced on complete decomposition of 1.35g of sodium nitride at 320K and 110kpa. the gas constant R= 8.31JK^-1 mol^-1. give your answer to 3 significant figures. (AO2)
- You wish to consider addition of methanol to groundwater for anaerobic biological removal of nitrate by denitrification. If the nitrate nitrogen (as N) concentration is 84 mg/l, what minimum concentration of methanol should be added to achieve complete nitrate reduction to nitrogen gas. Assume no ammonium is present and fs for the reaction is 0.30.What is the purpose of the hexane in the halogen displacement? Intowhich layer (water or hexane) would the following species reside?Cl‐, I2, Cl2, Br‐, I‐, Br2A 2.000 gram sample containing graphite (carbon) and an inert substance was burned in oxygen and produced a mixture of carbon dioxide and carbon monoxide in the mole ratio 2.00: 1.00. The volume of oxygen used was 747.0 milliliters at 1,092K and 12.00 atmospheres pressure. Calculate the percentage by weight of graphite in the original mixture.