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Chemistry problems help
1. A sample of unknown Y is subjected to elemental analysis. The following percentages 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 following 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 the 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?
An aqueous solution is 22.0% by mass silver nitrate, AgNO3, and has a density of 1.22 g/mL. What is the molarity of silver nitrate in the solution?
HCl + NaOH = NaCl + H2O If 200 mL of a .20 M HCl solution is consumed in the above reaction, how many grams of each product would be produced.
Find reactant and product information, Balance the following reaction: Mn + HCl --> MnCl2 + H2, If you have 100g of Mn and 100g of HCl find
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Determine the maximum number of electrons that could be emitted from metal by a burst of light with a total energy (E)of 9.86× 10^(-7) Joules?
A gas occupies 4.04 L at 860 torr and 10C. What volume will it fill if the pressure is changed to 731 torr and the temperature is raised to 43 0C?
Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 143 mL of ethanol.
An oil bath maintained at 50.5 oC loses heat to its surroundings at the rate of 4.68 kJ/min. Its temperature is maintained by an electrically heated coil with a resistance of 60 operated from a 110 V line.
A sample of helium gas has a volume of 241 mL at 0.83 atm. What pressure is needed to reduce the volume at constant temperature to 35 mL.
Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL.
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