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2H2 + O2 → 2H2O If 720.8 g of water are produced from the reaction, calculate the following: moles of H2: moles of O2: grams of O2: ***I am in urgent need of help***
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A 60.0 ml solution of 0.123 m potassium alaninate (h2nc2h5co2k) is titrated with 0.123 m hcl. the pka values for the amino acid alanine are 2.344 (pka1) and 9.868 (pka2), which correspond to the carbo
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A 10% glucose solution is placed in the thistle tube. the thistle tube is placed in a beaker that contains a 5% glucose solution. there is a differentially permeable membrane across the broad end of t
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For the reaction shown, compute the theoretical yield of product in grams, for each of the folling initial amount of reactants. 2 Al(s) + 3Cl2(g) = 2AlCl3(s)
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For the reaction shown, compute the theoretical yield of product in grams, for each of the following initial amounts of reactants. 2 Al(s) + 3 Cl2 (g) = 2 AlCl3(s)
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Write a conclusion that explains why you believe one alternative energy technology is better than the other. Your conclusion should include your analysis regarding the feasibility, cost, and benefits
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Consider the following equilibrium: 4KO2(s) + 2H2O(g) 4KOH(s) + 3O2(g) Which of the following is a correct equilibrium expression? Keq=[KOH]4[O2]3[KO2]4[H2O]2 Keq=[H2O]2[O2]3 Keq=[KO2]4[H2O]2[KOH]4[O2
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1. What are two ways that rocks are broken down into smaller pieces?2. Weathering and erosion are two processes that shape Earth's surface. Which of the following sets of factors causes both weatherin
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Humans exhale carbon dioxide when they breathe. If the concentration of carbon dioxide in the air that people breathe gets too high, it can be fatal. Therefore, in space shuttles, submarines, and othe
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How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 65.1 moles of water vapor?
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Elements 2,5,18,29, and 33 are colorless, odorless, unreactive gases. Of these gases , element 29 has the largest mass
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What determines the viscosity of magma? What else determines whether a volcano will erupt violently or calmly?
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All of these are required categories on a safety data sheet except A. manufacturer's trade name. B. physical/chemical characteristics. C. hazardous ingredients/identity information. D. manufacturer's
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A mixture of neon and carbon dioxide gases at a total pressure of 663 mm hg contains neon at a partial pressure of 190 mm hg. if the gas mixture contains 1.73 grams of neon, how many grams of carbon d
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Draw the structures of the two carbocation intermediates that might form during the reaction of 1-methylcyclopentene (above) with hbr.
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Be sure to answer all parts. what is the poh of 2.80 m ba(oh)2 solution? is the solution neutral, acidic, or basic? the poh of the solution is:
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Use the method of initial rates with the data in table 3.4 to determine the reaction order for naoh.
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The following equation shows the formation of water (H2O, 18.02 g/mol) from hydrogen (H2, 2.02 g/mol) and oxygen (O2, 32.00 g/mol): how many grams of water will form if 10.54 g H2 react with 95.10 g O
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A mixture is two or more substances that are mixed together but not chemically combined. The substances in a mixture each keep their own properties and can be separated from the mixture. Identify the
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Hydrogen gas and bromine vapor react to form gaseous hydrogen bromide at 1300 K. The value of the equilibrium constant is 1.6 x 105. What is the value of the equilbrium constant for the decomposition
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Josh decided to mix some vinegar with baking soda. He knew that a reaction occurred because he made careful observations. He noted that the mixture started to foam up and bubble and was white in color
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Why do you heat the empty crucible?1. To thermally decompose barium chloride dihydrate2. To prevent the water loss from barium chloride dihydrate3. To flame polish the crucible4. To prevent it from cr
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Given the balanced equation 3H2(g)+N2(g)=2NH3(g), calculate the mass of NH3 produced by the complete reaction of 2.55g of H2
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25 moles of nocl were placed in a 2.50 l reaction chamber at 427ºc. after equilibrium was reached, 1.10 moles of nocl remained. calculate the equilibrium constant, kc, for the reaction 2nocl(g) 2no(g
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If the initial concentrations of the reactants are both 2.70 m , what is the ratio of the rate of reaction a to the rate of reaction b?
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A solution contains 0.133 g of dissolved Lead. How many moles of soduim chloride must be added to the solution to completly precipitate all of the disolved lead?
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Looking across period 4 of the periodic table, potassium (atomic number 19) is followed by calcium (atomic number 20), which is followed by scandium (atomic number 21). Which element should have the l
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Water does not easily remove grease from dishes or hands because grease is nonpolar and water is polar. the addition of soap to water, however, allows the grease to dissolve. look at the structure of
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Part a: What volume of 10.0 M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? answer : 6.7ml Part B: The buffer from Part A is diluted to 1.00 L. To half of it (500. mL
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What is one reason why rock layers are not horizontal? A) they were formed at and angle B) a force pushed the rock layers after they were formed C)they were formed vertically D)the area was once cov
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You need to produce a buffer solution that has a ph of 5.42. you already have a solution that contains 10. mmol (millimoles) of acetic acid. how many millimoles of acetate (the conjugate base of aceti
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When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction caco3(s)→cao(s)+co2(g) how many grams of calcium carbonate are needed to produce 33.0 l of ca
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The concentrations of the products at equilibrium are [pcl3] = 0.170 m, and [cl2] = 0.150 m. what is the concentration of the reactant, pcl5, at equilibrium?
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More strong base is added until the equivalence point is reached. what is the ph of this solution at the equivalence point if the total volume is 30.0 ml ?
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How many grams of dry nh4cl need to be added to 2.50 l of a 0.200 m solution of ammonia, nh3, to prepare a buffer solution that has a ph of 8.51? kb for ammonia is 1.8×10−5.\?
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A 50.0-g sample of liquid water at 25.0 °c is heated by the addition of 73.5 j of energy. the final temperature of the water is ________ °c. the specific heat capacity of liquid water is 4.18 j/g-k.
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A solution of H2SO4(aq) with a molal concentration of 5.25 m has a density of 1.266 g/mL. What is the molar concentration of this solution?
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When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of O2
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A generic salt, AB, has a molar mass of 299 g/mol and a solubility of 7.40 g/L at 25 °C. What is the Ksp of this salt at 25 °C?
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Calculate the percentage by mass of NaCl in a solution that contains 233 grams of salt in a solution having a mass of 1235 g
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Which of the following indicates that an exothermic reaction has occurred? Temperature increases Heat is absorbed Salt is produced Water is formed
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Butanone undergoes a nucleophilic addition with a grignard reagent made from 1-bromopropane and magnesium metal in thf solution. the alkoxide formed from the nucleophilic addition is then conveted int
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Photosynthesis is an example of an exothermic chemical reaction in which plants use sunlight to make glucose and oxygen. Please select the best answer from the choices provided T
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Complete and balance each of the following equations for combustion reactions. C4H6(g)+O2(g) (right arrow) C(s)+O2(g) (right arrow) CS2(s)+O2(g) (right arrow) C3H8O(l)+O2(g) (right arrow)
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Which of the following expands to fill the container it is in, but can be compressed to a smaller volume when pressure is applied
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How much energy is released when 16.5 g of steam is condensed at 100oC? Hv = 2260 J /g. Question 4 options: -37290 J -3729 J -136 J -13 KJ
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Describe what happens to the temperature, the volume, and the phase composition (number of moles present)
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Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a 500 mL volumetric fask.Then 50.00 mL of the solution were pipetted into a flask and treated with excess KI (2g) an
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Write a balanced equation for the displacement of oxygen from hbo2 by co to produce hbco. write the equilibrium constant expression for your overall reaction
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HELP As you move up the food web, the amount of energy available to the organisms decreases, explain why this happens.
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