Chemistry Problems
1. A sample of unknown Y is subjected to elemental analysis. The follwoing precentages by weight are found to be:
C 40.0% H 6.7% O remainder of % by weight
The molar mass is found to be 60.0 g
A. Calculate the empirical formula (show work)
B. What is the molecular formula of unknown Y. (Include reasoning)
2. For the following compounds, draw the Lewis structures satisfying the octet rule. Show all the bonds and include any non-bonding pairs. Multiple bonds may be necessary in your final structures.
C3H8O C2H3CL
3. Refer to the follwoing chemical equilibrium to answer the questions below:
CH3NH2 + HCOOH<-> HCOO- + CH3NH3+
pKa = 3.75 pKa = 10.56
(in water@25degrees C) (in water@25degrees C)
a. What is the Ka of HCOOH?
b. What is te base on the left side of the equilibrium?
c. What is the conjugate base on the right side of the equilibrium?
d. Which side of the equilibrium is favored?
e. What is the pKb of HCOOH?
- Plain text response
- Attached file(s):
- Acids and bases-01.doc
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