Reference no: EM13500934
1) A sample of a complex salt, with ideal composition Ni(NH3)6(NO3)2, was analyzed for nickel by dissolution in slightly acidic solution and precipitation as the dimethylglyoximate, Ni(DMG)2.
A crucible of mass 14.1663 g was used to filter off the precipitate. The dried crucible and precipitate had a combined mass of 14.2633 g.
Theoretically calculated mass of Ni(NH3)6(NO3) = 0.0954g
-If the actual mass of the original sample in this experiment was 0.0836 g (instead of the theoretically calculated mass) -- indicating that the original Ni(NH3)6(NO3)2 complex had lost some ammonia -- what would be the corresponding value of n in the revised formula Ni(NH3)n(NO3)2.
-Calculate the percent loss of ammonia which accounts for the difference in the theoretical and actual mass of the initial sample.
2 ) A 6.80-g sample containing only Mn2(SO4)3(s) and Al2(SO4)3(s) is dissolved in aqueous solution. The metal ions are precipitated as hydroxides, which are pyrolyzed in air to produce 2.39 g of a mixture of Mn2O3(s) and Al2O3(s).
Molar mass of Mn2(SO4)3 is 398.1 g/mol.
Molar mass of Al2(SO4)3 is 342.1527 g/mol
What was the percent Mn in the original sample?
What was the percent Al in the original sample?
|
What can you conclude about whether these markets are
: Maryland Light, a U.S. light fixtures manufacturer, is considering an investment in Japan. The dollar cost of equity for Maryland Light is 11%. You are in the corporate treasury department, and you need to know the comparable cost of equity in Japane..
|
|
Explain how many grams of sucrose are there in a can of jolt
: A can of jolt cola contains 355ml of soda and weighs 387g. Use CRC handbook find the weight percent sucrose in Jolt. How many grams of sucrose are there in a can of jolt. does that agree with the manifacturer's claim that there are 42.5g of sucros..
|
|
Describe two designs that can address your research question
: In a few sentences, describe two designs that can address your research question. The designs must involve two different statistical analyses. For each design, specify and justify each of the four factors and calculate the estimated sample size..
|
|
What average force did the ball exert on the catcher
: a catcher catches a 145 g baseball traveling horizontally at 36.0 m/s. How large an impulse does the ball give to the catcher, what average force did the ball exert on the catcher
|
|
Explain a sample of a complex salt with ideal composition
: A sample of a complex salt, with ideal composition Ni(NH3)6(NO3)2, was analyzed for nickel by dissolution in slightly acidic solution and precipitation as the dimethylglyoximate, Ni(DMG)2.
|
|
Obtain the focal length of the eyepiece
: The near point of a naked eye is 25 cm. When placed at the near point and viewed by the naked eye, a tiny object would have an angular size of 5.2 10-5 rad. Find the focal length of the eyepiece in cm
|
|
A quality assurance inspector measures 10 bottles
: Cough-a-Lot children's cough syrup is supposed to contain 6 ounces of medicine per bottle. However since the filling machine is not always precise, there can be variation from bottle to bottle. The amounts in the bottles are normally distribut..
|
|
Evaluate the maximum number of milligrams of h2o
: Calculate the maximum number of milligrams of H2O that can possibly be extracted from 1.00g of tetraphenylarsonium chloride dihydrate
|
|
Concise statement of the issues and consequences
: A memo question will be assigned during lecture or tutorial and a written description of that question will be posted to the assignment section of Blackboard. A total of four to five Memos will be assigned during the term.
|