Which initial substance remained in excess
The reaction 2Al + 3MnO ----> Al2O3 + 3Mn proceeds till the limiting substance is consumed. A mixture of 220g Al and 400g MnO was heated to initiate the reaction. Which initial substance remained in excess and by how much?
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Glacier acetic acid and acetic anhydride is used for thepreparation of SnI4. These two compounds help SnI4 by creating awater free environment.
We want to prepare a buffer of pH 8.5643 by adding HCN and NaCN to 1.860 L of solution. What is the ratio of HCN to NaCN (both given in moles) necessary to obtain the desired pH? [Note: Ka(HCN) = 4.900x10-10]
Chlorine reacts with pentane to form a variety of products. Draw the mechanism for the formation of 2-chloropentane. Indicate the stereochemistry of theintermediates and the stereochemistry of the resulting products.
In terms of kinetic molecular theory, explain why pumping air into a collapsed soccer ball causes the ball to increase in size and become rigid.
Assume that you desire a minimum uncertainty in the positionofelectron of 10-10m. What is the maximum uncertainty that is acceptable in the momentum of the particle?
A bottle of Acetaminophen (Tylenol) containing 75 tablets (325-mg each) sells for $2.29. Calculate the cost of one billion tablets. How many grams of Acetaminophen (Tylenol) are needed to make those one billion tablets?
Copper in salt water near the discharge of a sewage treatment plantis determined by first seperating and concentrating it by solventextraction of its dithizone chelate at pH 3 into methyl chlorideand then evaporating the solvent.
0.300 moles of an unknown monobasic weak acid are added to 1.20 L of water. The resulting solution has a pH of 8.800. What is the Ka of the conjugate acid of the unknown base? Assume no change in volume.
When a 0.6333-g sample of a compound of carbon, hydrogen and sulfur was burned in excess oxygen, 0.9272 g CO2, 0.3795 g H2O and 0.6749 g SO2 were obtained.
Calculate the velocity of an electron in the n=1 state of H atom? Show that the de Broglie wavelenth of an electron moving at velocity(velociy of an e- in n=1 state of H atom) corresponds to circumference of the first Bohr radius?
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