A laboratory analysis of vanillin, the flavoring agent in vanilla, determined the mass percent composition: c, 63. 15%; h, 5. 30%; o, 31. 55%. Determine the empirical formula of vanillin.

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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

True or falseaccording to the fifth amendment people cannot be tried for the same exact crime more than once