Other Chemistry Answers

1. A 50.0-mL aliquot of unknown Cu(II) solution was exhaustively electrolyzed to deposit all copper on the cathode. The mass of the cathode was 15.327 g prior to electrolysis and 16.414 g after electrolysis. Find the molarity of Cu(II) in the unknown.

A. Find the length of the following confidence interval.

1. Upper limit = 0.995

  Lower Limit = 0.437

2. Upper limit = 394.14

  Lower Limit = 354.74

3. Upper limit = 0.02946

  Lower Limit = 0.02244

4. 0.475 < p < 0.735

5. 0.355 < p < 0.570

When 2.00 grams of KMnO4 (MW = 158.0 g/mol) is dissolved into 100.0 mL of solution,

what normality results? How many grams of KMnO4 are needed to make 500.0 mL of

a 0.200 N solution?

Convert 0.169 Molar HC2H3O2 to % (m/V).

One gram of sodium hydroxide pellets is dissolved in two hundred-fifty milliliters water.

What is the molarity, molality and normality of the solution? Assume that the density

of solution to be approximately that of the water and the density of sodium hydroxide

pellets to be 2.13 g/cm3

1. What is the [H3O+ ] of 1.0 M  HF mixed with 1.0 M NaF. Ka = 6.6 x 10-4 

If 0.454 kg of nitroglycerin explodes according to the following reaction: C3H5(NO2)3(l)  →\rightarrow → CO2(g) + N2(g) + H2O + O2(g) What is the total volume of gases in dm3 produced at STP?

1. Which of the following is the same as the median score?

M. 2 nd quartile T. 25th percentile A. 6 th decile H. 75th percentile