A solution of 5. 0 g benzoic acid (c6h5cooh) in 100. 0 g of carbon tetrachloride has a boiling point of 77. 5° c. The boling point of pure ccl4 is 76. 5° c. Calculate the molar mass of benzoic acid in the solution based on the boiling point elevation. (kb for ccl4 is 5. 03° c/m. ).

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

The graph shows the populations of two species over time. which type of symbiotic relationship does the graph represent? a. commensal b. mutualistic c. parasitic d. parent-offspring e. predator-prey

Use the rule of 72 to calculate how long it will take for your money to double if its earning 6% in interest. a. 12yrs b. 16yrs c. 36yrs d. 72yrs