Reference no: EM13125774
Chemistry help: Problems
A sample containing 0.2784 grams of sodium chloride (NaCl) and 0.5486 grams of magnesium chloride (MgCl2). The chloride in the sample was precipitated by the addition of 47.8 mL of a silver nitrate solution. What is the concentration of the silver nitrate solution?
A sample of ore containing manganese weighed 1.2354 grams. This sample was heated in a solution of nitric acid, which dissolved the manganese ion producing manganese(III) nitrate [Mn(NO3)3]. The acidity of the solution was adjusted, and hydrogen sulfide gas was bubbled into the solution producing 0.2876 grams of manganese(III) sulfide [Mn2S3]. What is the percentage of manganese in the original sample?
A sample containing Al2O3 and Na2Cr2O7?2H2O was brought into the laboratory for analysis. The analyst heated a 2.2846 gram sample of this material to 100 °C for one hour, at which time only Al2O3 and Na2Cr2O7 remained. This mixture was found to weigh 2.2312 grams. Calculate the percent chromium in the sample
Given that the solubility product for La(IO3)3 is 1.0 x 10-11, what is the concentration of La3+ in a saturated solution of lanthanum iodate?
If a 0.100 M solution of NaOH is added to a solution containing 0.200 M Ni2+, 0.200 M Ce3+, and 0.200 M Cu2+, which metal hydroxide will precipitate first? Ksp for Ni(OH)2 = 6.0 x 10-16, Ksp for Ce(OH)3 = 6.0 x 10-22, and Ksp for Cu(OH)2 = 4.8 x 10-20.
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Define equilibrium constant from standard potential data
: Equilibrium constant from standard potential data, Calculate the equilibrium constants of the following reactions at 25°C from standard potential data
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What portion of the test takers scored between 70 and 130
: In a recently administered IQ test, the scores were distributed normally, with mean 100 and standard deviation 15. What portion of the test takers scored between 70 and 130?
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What is their current yield
: Garvin Enterprises' bonds currently sell for $1,150. They have a 6-year maturity, an annual coupon of $85, and a par value of $1,000. What is their current yield?
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Illustrate what issues should sam and marcie address
: Sam will continue to manage the business. He is not willing to own less than 50% of whatever arrangement they arrive at. Illustrate what issues should Sam and Marcie address and document before finalzing their venture?
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Define what is the concentration of la
: Given that the solubility product for La(IO3)3 is 1.0 x 10-11, what is the concentration of La3+ in a saturated solution of lanthanum iodate?
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What are the assumptions that must be met about her data
: What are the assumptions that must be met about her data before she can correctly use an independent t-test to test the hypotheses? Why? How would she see if her data meet these assumptions? How much room does she have to violate any of these assumpt..
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Why is it important to distinguish debt cancellation
: Why is it important to distinguish debt cancellation from a gift, bequest, or renegotiation of a purchase price?
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Calculate the the equilbrium constant
: At a certain temperature the equilbrium constant is 396 K for H2(g) + I2(g) ↔ 2HI(g) , Calculate the the equilbrium constant for 0.5H2(g) + 0.5I2(g) ↔ HI(g)
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Every group of prime order is cyclic
: Relation between Cyclic Group and Abelian Group. If G is a finite group whose order is a prime number p, then G is a cyclic group. Or, Every group of prime order is cyclic. Or, Every group of prime order is abelian.
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