Question

Gases are most likely to be found in a phase diagram under conditions of high temperature and high pressure high temperature and low pressure low temperature and high pressure low temperature and low pressure moderate temperature and pressure Problems in this section are worth six each plus 4 additional point for work shown in the blue booklet. The half-life of the radioisotope^158 Eu is 0.77 h. How much time is required for a 160.0-g sample of^158 Eu to decay to 1.59 g? 6.0 h 4.0 h 3.0 h 2.2 h 5.1 18. A fuel cell designed to react grain alcohol with oxygen has the following net reaction: The maximum work that I mol of alcohol can yield by this process is 1320 kJ. What is the theoretical maximum voltage that this cell can achieve? 1.14 V 2.28 V 2.01 V 0.760 V 13.7 V A voltaic cell is made by placing an iron electrode in a compartment in which the Fe^2+ concentration is 2.0 Times 10^-5 M and by placing a Pt electrode in the other compartment, in which the H^+ concentration is 3.4 M and -^P M = 1.00 atm. The Fe^2+/Fe half-cell reduction potential u -0.41 V. and the H^+/H_2 half-cell reduction potential is 0.00 V. What is the value of f? for this cell, and which electrode is the anode? 0.41 V, Fe 0.90 V,Pt -0 41 V, Pt -0.41 V, Fe 0.41 V.Pt

Answer 1

Answer 16) Correct answer is option B: High Temperature and low pressure.

SelidLiquid ree poinrt Pessure → Tripe point. Subtimation Gas

Answer 17) t_1/2= 0.77h, A_o= 160 g and A= 1.59 g calculate t=?

                                   A= A_o × 2^-(t/t_1/2⁾

                                    1.59 = 160 × 2-(t/0.77)

                                ln(1.59/160) = -t/0.77 × ln 2

                                          -4.611 = -0.9t

                                              t= 5.12 h