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An herbicide is found to contain only C, H, N, and Cl. The complete combustion of a 100.0-mg sample of the herbicide in excess oxygen produces 83.16 mL of CO2 and 73.30 mL of H2O vapor at STP. A separate analysis shows that the sample also contains 16.44 mg of Cl.
(a) Determine the percent composition of the substance.
(b) Calculate its empirical formula.
(c) What other information would you need to know about this compound to calculate its true molecular formula?
A sample of gas has a mass of 827mg. its volume is 0.270L at a temperature of 88 degree C and a pressure of 975 mmHg. Find its molar mass.
In the balanced molecular equation for the neutralization reaction between phosphoric acid and potassium hydroxide, the products are: a. 3H2O b. K3PO4 + 3H2O c. KPO4 + H3OH d. K+(aq) + PO43-(aq) + 3H+ + 3OH-
the value of eo for the following reaction is 0.63v. what will the cell potential be when the zn2 0.00020m and the pb2
what two families of elements in the periodic table generally do not accept additional electrons i.e. which ones have
Lakes that have been acidified by acid rain (HNO3 and H2SO4) can be neutralized by a process called liming, in which limestone (CaCO3) is added to the acidified water. What mass of limestone (in Kg) would completely neutralize a 15.5 billion-liter..
Suppose that in a certain location the temperature increases by 20°C per kilometer of depth and the thermal conductivity of the rock is 2.5 W /m·K. What is the rate of heat conduction per square meter in this location?
If you are given a 0.33 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced
Explain A mixture of amino acids (Lys, Ala, and asp) is subjected to cation exchange chromatography at pH 3.0 . Depict the structure of the amino acids as they would exist at pH 3.0
a plant manufacturing nails and screws uses a large pool volume 10000 l to collect and treat its residual waste water
Comment on whether these are made of the same materials or not, and explain your response. The density is different in each, so they are made of different materials.
It is possible to determine the ionization energy for hydrogen using the Bohr equation. Calculate the ionization energy for an atom of hydrogen, making the assumption that ionization is the transition from n=1 to n=infinity.
A buffer is composed of 0.400 mol H2PO4^- and 0.400 mol HPO4^2- diluted with water to a volume of 1.00 L. The pH of the buffer is 7.210. How many moles of HCl must be added to decrease the pH to 6.210?
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