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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?
The solubility product of Mg(OH)2 is 1.2E-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg2+ concentration in a solution of Mg(NO3)2 to less than 1.9E-10 M?
How many molecules of carbon dioxide are produced when 123 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
Final temperature after urea dissolves in water, What is the final temperature of the solution in kJ? The density of water is 4.18 J/g·°C. What is the final temperature in °F? F = °C x 1.8 + 32 (Round your answer to one decimal place)
The partial pressure and Henry's law constants for SO2 and H2O2 are 2.7 ppm (KH = 1.2 mol L-1atm-1) and 4.9 ppb (KH = 1.0E5 mol L-1atm-1), respectively. Calculate the reaction rate of this process.
If, in a certain experiment, over a specific time period, 0.0033 mol PH3 is consumed in a 1.5-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
If 175 g of X reacts completely with diboron trioxide to produce 2.43 mol of B4X3, what is the identity of X?
Octane has a density of 0.692 g/mL at 20 Celsius . How many grams of O2 are required to burn 1.30 gal of C8H18
A compound, A, c6h8, yields a single organic product, B, upon ozonolysis and absorbs two moles of hydrogen on catalytic hydrogenation to give C
Determine How many moles each of Na+ and Cl- are in 0.800 L A physiological saline solution contains 172mEq/ L each of Na+ and Cl-of the saline solution?
On treatment of Compound D with an alcoholic solution of silver ammonium hydroxide, a silver mirror was formed within a few minutes. Identify the hydrocarbon A and Compounds B-D.
When ethanol burns C2H5OH + 3O2 ==> 2CO2 + 3H2O , how many moles of water are produced as 48.380 moles of carbon dioxide are produced.
the heat of combustion of butane is -2878kj/mol assume a typical cigarette litter hold about 1.75 grams of butane how much energy would be released
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