Master Chemistry with Fun Quizzes & Brain Teasers!

consider the equilibrium system described by the chemical reaction below. if 0.1908 moles of co2, 0.0908 moles of co and 0.0092 moles of h2o are present in a 2.00 l reaction vessel at equilibrium at 300 k what is the value of kc of the reaction at this temp?
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calculate the mass percent of a nacl solution prepared by mixing 35.0 g nacl with 125.0 ml of pure water.
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how many liters will 25.0 moles of gas occupy if it has a temperature of 315k and a pressure of 80.0 psi?
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a mass of 48.5 g of a certain substance can be dissolved in 29.1 ml of water at 20 degrees c calculate solubility of this substance per gram of water
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when 35.00 grams of niobium is mixed with 75.00 grams of iodine the percent yield for the product is 63.29%. what mass of product (in grams) formed?
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based on their structures, rank phenol, benzene, benzaldehyde, and benzoic acid in terms of lowest to highest boiling point. explain your reasoning.
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this is the chemical formula for acetic acid (the chemical that gives the sharp taste to vinegar): an analytical chemist has determined by measurements that there are moles of carbon in a sample of acetic acid. how many moles of oxygen are in the sample? be sure your answer has the correct number of significant digits.
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7. a student chose 1m acetic acid as the buffer solution to inhibit the ph change of an aqueous solution. if a strong acid is added to the solution, would this buffer solution inhibit the change of ph to the aqueous solution? explain.
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. n specifies fill in the blank 4 l specifies fill in the blank 5 ml specifies fill in the blank 6 ... a.the orbital orientation. b.the energy and average distance from the nucleus. c.the subshell - orbital shape.
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for water to change into the gas phase, energy is required to break hydrogen bonds between h2o molecules. this energy is referred to as: a. latent heat b. specific heat capacity c. sensible heat d. kinetic energy
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a solution containing a kcl dissolved in water will have a than that of pure water. multiple choice higher boiling point and a lower freezing point none of the answers can be determined with the information provided. lower boiling point and a lower freezing point lower boiling point and a higher freezing point higher boiling point and a higher freezing point
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Arrange these elements according to electron affinity.You are currently in a ranking module. Turn off browse mode or quick nav, Tab to move, Space or Enter to pick up, Tab to move items between bins, Arrow Keys to change the order of items, Space or Enter to drop.Most energy released by gaining an electron Most energy absorbed by gaining an electronAnswer BankHe, C F
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what are the correct coefficients if the law of conservation of mass is applied to the decomposition of solid ammonium nitrite to nitrogen gas and liquid water?
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The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction: 4PH3(g) P4(g) + 6H2(g) The half-life of the reaction is 35.0 s at 680C. a.) the first-order rate constant for the reaction and b.) the time required for 95 percent of the phosphine to decompose.
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a gc analysis of a mixture containing two compounds dissolved in pentane produced the following peak areas: compound 1 5 23.2, compound 2 5 56.3, and pentane 5 203.5. relative mf values are 0.85 for compound 1 and 1.00 for compound 2. calculate the corrected mol % for compounds 1 and 2 in the mixture.
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a chemist reacted 0.20 moles 4-aminophenol (109.13 g/mol) with 0.25 moles of acetic anhydride (102.09 g/mol) to synthesize acetaminophen. if 22 g acetaminophen (151.163 g/mol) was generated, what was the percent yield of the reaction? (only type the number, not the percent sign)
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7. during a recrystallization, the dissolved compound is sometimes treated with activated carbon, why?
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what volume of 0.162 mna3po4 solution is necessary to completely react with 91.4 ml of 0.104 m cacl2 ?
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what is the relationship between the keto and enol forms of acetone, ch3coch3? group of answer choices
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the last 10,000 years is called the group of answer choices cenozoic. solutrean. holocene. quaternary.
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how to find the boiling point of a compound using thermodynamic data enthalpy, s and gibbs free energy
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how many atoms of mercury are in a spherical drop of mercury (hg) that has a diameter of 1.0 mm. (dhg
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which halogen forms the weakest bond to carbon? rev: 12 08 2020 qc cs-243801 multiple choice f cl br i
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the elemental mass percent composition of succinic acid is 40.68% c , 5.12% h , and 54.19% o . determine the empirical formula of succinic acid.
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