5.92 Question 2 1 pts The LD50 of KCN for a 75kg person is 375mg. If this amount of KCN was put into a single cup (275mL) of coffee, what would be the concentration of the KCN in moles per liter? No answer text provided. 0.733 1.36 0.0209 Submit Ouiz No new data to save Last checked at 5:24pm 45 AGES

5.92 Question 2 1 pts The LD50 of KCN for a 75kg person is 375mg. If this amount of KCN was put into a single cup (275mL) of coffee, what would be the concentration of the KCN in moles per liter? No answer text provided. 0.733 1.36 0.0209 Submit Ouiz No new data to save Last checked at 5:24pm 45 AGES

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter5: Gases

Section: Chapter Questions

Problem 161IP: In the presence of nitric acid, UO2+ undergoes a redox process. It is converted to UO22+ and nitric...

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In the presence of nitric acid, UO2+ undergoes a redox process. It is converted to UO22+ and nitric oxide (NO) gas is produced according to the following unbalanced equation: H+(aq)+NO3(aq)+UO2+(aq)NO(g)+UO22+(aq)+H2O(l) If 2.55 102 mL NO(g) is isolated at 29C and 1.5 atm, what amount (moles) of UO2+ was used in the reaction? (Hint: Balance the reaction by the oxidation states method.)
In 1897 the Swedish explorer Andreé tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The hydrogen gas was prepared from iron splints and diluted sulfuric acid. The reaction is Fe(s) + H2SO4(aq) -> FeSO4(aq) + H2(g) The volume of the balloon was 4400 m3 and the loss of hydrogen gas during filling was estimated at 10.%. What mass of iron splints and 98% (by mass) H2SO4 were needed to ensure the complete filling of the balloon? Assume a temperature of 0°C, a pressure of 1.0 atm during filling, and 100% yield. Mass of Fe = ______g Mass of H2SO4= ______g
If a bag of fertilizer were labeled as containing 35% K2O, a. What is the analysis when expressed as %K? b. Assume the bag is labeled as 150% P, calculate the percentage P2O5 in the bag.
The combustion of liquid ethanol (C2H5OH)(C2H5OH) produces carbon dioxide and water. After 4.63 mLmL of ethanol (density=0.789g/ml)(density=0.789g/ml) was allowed to burn in the presence of 15.50 gg of oxygen gas, 3.70 mLmL of water (density=1.00g/ml)(density=1.00g/ml) was collected. Determine the theoretical and percent yeild of h2o in the reaction.
Assume that a single cylinder of an automobile engine hasa volume of 524 cm3. (a) If the cylinder is full of air at 74 °Cand 0.980 atm, how many moles of O2 are present? (Themole fraction of O2 in dry air is 0.2095.) (b) How manygrams of C8H18 could be combusted by this quantity ofO2, assuming complete combustion with formation ofCO2 and H2O?
The reaction is balanced: citric acid: 3NaHCO3 + C6H10O8 -> Na3 C6H7O8 + 3H2O + 3 CO2 Show the calculations required to determine quantities of sodium hydrogen carbonate and citric acid: (3NaHCO3 + C6H10O8) . Pressure is 100.800kPa, Temperature is 23 C and Volume is 784ml.
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.
For divers going to great depths, the composition of the air in the tank must be modified. The ideal composition is to have approximately the same number of O2 molecules per unit volume as in surface air (to avoid oxygen poisoning), and to use helium instead of nitrogen for the remainder of the gas (to avoid nitrogen narcosis, which results from nitrogen dissolving in the bloodstream). Of the molecules in dry surface air, 78.0% are N2, 21.0% are O2, and 1.00% are Ar. (Assume that the density of seawater is 1025 kg/m3 and the temperature is 20.0°C.) Density of dry air at 20.0°C is 1.20 kg/m3. Molar mass of N2 is 14.007 g/mol, O2 is 15.999 g/mol, and Ar is 39.948 g/mol. a: How many O2 molecules per cubic meter are there in surface air at 20.0°C and 1.00 atm? b: For a diver going to a depth of 141 m, what percentage of the gas molecules in the tank should be O2?
Assume that a single cylinder of an automobile engine hasa volume of 524 cm3. (a) If the cylinder is full of air at 74 °C and 0.980 atm, how many moles of O2 are present? (Themole fraction of O2 in dry air is 0.2095.) (b) How manygrams of C8H18 could be combusted by this quantity ofO2, assuming complete combustion with formation ofCO2 and H2O?
Wine goes bad soon after opening because the ethanol CH3CH2OH in it reacts with oxygen gas O2 from the air to form water H2O and acetic acid CH3COOH , the main ingredient of vinegar. What mass of ethanol is consumed by the reaction of 3.6g of oxygen gas?
1. One of the first families of rockets used by the American space program was the Redstonefamily of rockets. The first Redstone rockets (in the 1950s) used B10H14 (often called decaborane)as a rocket fuel that reacts violently with liquid di-oxygen to make diboron trioxide and steam.When used as a rocket fuel, scientists carefully calculated the amount necessary so that bothcomponents ran out at the same time. (Excess fuel would be excess weight for the rocket tocarry.) If the total mass of both reactants put together is 12.0  104 kg, what was the volume ofliquid di-oxygen carried by the rockets? (Liquid di-oxygen has a density of 1.141 g/mL.)
solve for the gravemetric factor of the following: Substance weighed: Fe2O3 Substance sought: K3Fe(CN)6