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Nicotine, a stimulant found in tobacco, has the mass percent composition: C, 74.03%; H, 8.70%; N, 17.27%. The molar mass of nicotine is 162.23 g/mol. Find the molecular formula of nicotine.
Spectroscopists have observed He+ in the outerspace. This ion is a one-electron species lik ea neutral hydrogenatom. Calculate the energy emitted for the transition from the n =5 to the n = 3 state in this ion using the equation:
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hoff factor for NaCl is 1.87.
You dilute it with 25mL of water and 10mL of H2SO4. You titrate the solution with 19.80 mL of KMnO4. The (MnO4)- is reduced to (Mn) 2+ by the unknown solution. a) What is the equivalent weight of (MnO4)- for the experiment
question what is the side reaction that occurs or what side products are generated during a thiamine catalyzed benzoin
What is the pH of the solution when the titration is half way to the end point?
You prepare a buffer solution from 10.0mL of 0.100 M MOPS 3-morpholinopropane-1-sulfonic acid as well as 10.0mL of 0.085 M NaOH. Next, you add 1.00mL of 2.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, compute the fraction of lidoc..
Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g)?CO(g)+3H2(g) In a particular reaction, 26.0L of methane gas (measured at a pressure of 734torr and a temp..
Problem- A polypeptide contains 3 lys and 2 arg residues (internal). Assuming cleavage was 100% efficient how many peptide fragments can be expected after cleavage with enzyme trypsin
Further recylcing reactions that would take the products back to some of the monomers. What reactions to use? What would you get as products
1. explain why bothcisandtransisomers are possible for conh32c2o42-but only the cisisomer is possible for conh34c2o4.2.
The molar heat of vaporization of ethanol is 39.3 kj/mol, and the boiling point of ethanol is 78.3 C. Calculate delta S for the vaporization of .3 mol ethanol.
What is the percent purity of NaHCO3 in your baking soda? (The formula weight of NaHCO3 is 84.007 g/mole).
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