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Question:
When a sample of vanillin weighing 2.500g burns in oxygen, 5.79g of CO2 and 1.18g of h20 are obtained. What is the empirical formula of vanillin
Write the equation showing the S-trans to S-cis equilibrium of the two conformations for a. (E)-1,3-pentadiene b. (Z)-1,3-pentadiene and which equilibrium will favor the s-tans conformation more strongly?
From this stock solution, the student then took 2.00mL and diluted it to a final volume of 10.00mL with water. What is the final concentration of this diluted solution
An electron in a He+ ion transitions from the n=2 state to the ground state. What is the frequency of the light emitted? I got 2.5E15 s^-1, but the answer said 9.9E15 s^-1. Why?
Twenty grams of liquid mercury at 98.0 °C is placed in 47.0 g of water initially at 25.0 °C. What is the final temperature of the water, assuming the styrofoam calorimeter absorbs no heat at all?
What is the concentration of KMnO4 when you mix 2 mL of .160 M KMnO4 with 10 mL of .250 M oxalic acid. Assuming that it took 120 s to observe the color change in the reaction, what is the rate of the reaction
You have a solid A with an impurity B and you would like to purify A. Your initial? mixture is 80% A and 20% B (where A and B have the same molecular weight). As often occurs in organic chemistry, both the impurity and the desired component in a s..
Define three examples each of acids, bases and salts commonly utilized in therapeutic processes. From the instance you state, select one acid, one base and one salt and explain how and where they are used in therapeutic processes.
calculate the uncertainty in nm in the position of an electron with the velocity of 2.00x103 ms the velocity is the
A solution of 350mg of optically active 2-butanol in 10 mL of water, placed in a 20 cm cell shows an optical rotation of +6 .24 degrees. What is the specific rotation of this compound
What is the molarity of a solution of 14.0 g NH4Br in enough H20 to make 150 ML of solution.
The region in a baseball diamond between the bases is a square that is 90 ft on each side. On a given rainy day 2.5 inches of rain fell on the field. What is the mass of the rain that fell in the diamond in grams
A hypothetical lake has a surface area of 23 acres and an avgage depth of 20 ft. Recently there was an accident where a truck spilled 9,000 gals of concentrated H2SO4 (18M) directly into the lake.
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