You must submit both an answer and explanation for an answer in order for you to

Question

You must submit both an answer and explanation for an answer in order for you to receive credit for this assignment. Show your work.

1) What mass (in g) of NH3 must be dissolved in 475 g of methanol to make a 0.250 m solution?

2) How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

3) Calculate the molality of a solution that is prepared by mixing 25.5 mL of CH3OH (d = 0.792 g/mL) and 387 mL of CH3CH2CH2OH (d = 0.811 g/mL).

4) What is the mol fraction of ethanol, C2H5OH, in a solution of 75.3g of ethanol and 525g of water?

5) Determine the freezing point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a melting point of 5.50°C and a freezing point depression constant of 4.90°C/m.

6) Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of 80.1°C and a boiling point elevation constant of 2.53°C/m.

7) Determine the rate law and the value of k for the following reaction using the data provided.

      S2O82(aq) + 3 I(aq) 2 SO42(g) + I3(aq)     [S2O82]i (M)     [I]i (M)   Initial Rate

                                                                                       0.30                      0.42           4.54

                                                                                       0.44                      0.42           6.65

                                                                                       0.44                      0.21           3.33

8) Determine the rate law and the value of k for the following reaction using the data provided.

      NO2(g) + O3(g) NO3(g) + O2(g)      [NO2]i (M)          [O3]i (M)          Initial Rate

                                                                       0.10                      0.33                   1.42

                                                                       0.10                      0.66                   2.84

                                                                       0.25                      0.66                   7.10

9) A reaction is found to have an activation energy of 108 kJ/mol. If the rate constant for this reaction is 4.60 × 10-6 s-1 at 275 K, what is the rate constant at 366 K?

10) Given the following proposed mechanism, predict the rate law for the overall reaction.

            2NO2 + Cl2 2NO2Cl (overall reaction)

            Mechanism

            NO2 + Cl2 NO2Cl + Cl    slow

            NO2 + Cl NO2Cl        fast

A) Rate = k[NO2][Cl2]

B) Rate = k[NO2]2[Cl2]2

C) Rate = k[NO2][Cl]

D) Rate = k[NO2Cl][Cl]2

E) Rate = k[NO2Cl]2

Explanation / Answer

You must submit both an answer and explanation for an answer in order for you to

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.