Chapter 3, Problem 3.1QAP

Richards and Williard determined the molar mass of lithium and collected the following data  (a) Find the mean molar mass determined by these workers.  (b) Find the median molar mass (c) Assuming that the currently accepted value for the molar mass of lithium is the true value, calculate the absolute error and the present relative error of the mean value determined by Richards and Williard.  (f) What factors have led to changes in molar mass since 191?  (g) How would you determine the accuracy of a molar mass?   Experiment  Molar mass, g/mol 1 6.9391 2 6.9407 3 6.9409 4 6.9399 5 6.9407 6 6. 9391 7 6. 9406

The thermostat shows that the room temperature is 21.7°C. Convert 21.7°C to Kelvin and Fahrenheit units. Be sure to answer all parts. (a) K (b) PF

A(s)+3B(l)−⇀↽−2C(aq)+D(aq)A(s)+3B(l)↽−−⇀2C(aq)+D(aq) in terms of [A],[A], [B],[B], [C],[C], and [D],[D], as needed. Note that Kc,Kc, which is sometimes symbolized as Keq,Keq, denotes that the equilibrium constant is expressed using molar concentrations. For this question, KcKc means the same thing as Keq.Keq. Kc=Kc=

You are given a hammer a battery, a bulb, wires and switch(a) How could you use them to distinguish between samples of metals and non metals?(b) Assess the usefulness of these tests to distinguish between metals and non-metals

Archimedes, a famous Greek scientist, was given a problem by King Hieron II of Syracuse (Sicily). The king suspected that his crown, which was supposed to be made of pure gold, contained some silver alloy, and he asked Archimedes to prove or disprove his suspicion. (It turned out that the crown did not contain silver.) How would you experimentally determined whether or not the crown was pure gold? (Hint: The method came to Archimedes when getting into a full bathtub. See the footnote in Experiment 22 for Archimedes’ solution.)

CH,N, Et,0, CH,Cl, 30 min HO,

In Active Example 3-29 you calculated that you would have to work six weeks to earn enough money to buy a 1082.49 television. You would be working five shifts of four hours each at 9.25/hr. But, alas, when you received your first pay check, you found that exactly 23 of your earnings had been withheld for social security, federal and state income taxes, and workers compensation insurance. Taking these into account, how many weeks will it take to earn the 1082.49?

(1) Br2 CC,

Use the meaning of the prefix "nano-"  to select the value of "x" in this equation:                   1 m   =   1 x 10x  nm   .   The value of  " x  "  is      (a)  +9                 (b)  -6              (c)  +6               (d)  -9