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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?
Consider the reaction HgS + O2 → SO2 + Hg. If 200.0 grams of HgS reacted with 150.0 grams of O2, what is the limiting reagent.
Determine the average atomic mass of boron is the natural abundance of 10B weighing exactly 10.0129 amu is 80.1% and the natural abundance of 11B weighing exactly 11.0093 amu is 19.9%.
Converting Voltages, Convert the following voltages. Assume the silver-silver chloride and calomel reference electrodes are saturated with KCl, giving cell potentials of +0.197 V and +0.241, respectively.
Consider the gas-phase reaction A + 2B 2C + D. Starting with 1.0 mole of A and 1.0 mole of B in 2.0 liter container, the reaction proceeds to equilibrium at T = 103C with 8.6 × 10-2 moles of C now present.
14.0 moles of gas are in a 6.00 L tank at 22.6 C. Calculate the difference in pressure between methane and an ideal gas under these conditions.
Assume that the wet limestone process requires 1 metric ton of calcium carbonate to remove + 85.0 % of the sulfur from 4 metric tons of coal containing + 10.0 % S Assume that the sulfur product is calcium sulfate.
Carbon monoxide gas reacts with hydrogen gas at elevated temperatures to form methanol according to this equation. CO(g) + 2 H2(g) CH3OH (g)
Molarity of sodium carbonate, How many grams of primary standard grade sodium carbonate are necessary to prepare 2.00 L
What is the molecular weigh of acetic acid that will form 2 moles of CO2 assuming complete combustion.
Explain the following observations. 1. Aziridines, compounds that contain nitrogen in a three-membered ring, undergo pyramidal inversion much more slowly than do other alkylamines
a photon of wavelength 40.0nm is used to eject an electron with the energy 22.3eV from a molecule.calculate the ionization energy of the molecule and tha associated wavelength of the elctron..
Determine the delta G standard state at 298 K from the following standard state values at T= 298, Determine the delta G standard state at 1000K. assume delta H is independent of temperature
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