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1. 0.47 moles of Sodium were reacted with 26g of Copper(II) Nitrate? If the actual yield of copper metal was 1.43g, what is the percentage yield of this reaction?
2. What is the equivalent of 456 torr in atmospheres (atm)?
3. When a 2.3L sample of hydrogen gas at 25oC is heated to 120oC at constant pressure, what is the new volume of the gas?
A cube of metal which looks like gold (Au, 19.32 g/cm3) is suspected by a modern Archimedes of being either iron (Fe, 7.90 g/cm3) coated with gold or aluminum
Which of the following has only a single peak in the proton NMR spectrum
A proton in a linear accelerator has a de Broglie wavelength of 138 pm. what is the speed of the proton?
An Ice cube tray holds 325 grams of water. If the water initially has a temperature of 25 C, how many kilojoules of heat must be removed to cool and freeze the water 0 C?
In the laboratory, a student named Georgia weighed 4.75 grams of an unknown solid mixture containing benzoic acid, copper (II) sulfate and sand. She added 15mL of acetone to her sample. Which component of the mixture is dissolved in the acetone?
A 270- mL flask contains pure helium at a pressure of 749 torr. A second flask with a volume of 470 mL contains pure argon at a pressure of 730 torr what is the partial pressure of He?
a 55.0g piece of copper wire is heated, and the temperature of the wire changes from 19.0C to 86.0C. The amount of heat absorbed is 1.4 kilojoules. What is the specific heat of copper?
what is the molarity of a solution made by dissolving 26.42g of (NH4)2SO4 in enough H2O to make 500 mL of solution?
Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h.
The amount of energy needed to heat 2.00 g of carbon from 50.0 C to 80.0 C is 42.6 J. what is the specific heat capacity of this sample of carbon.
If the total mass of the mixture is 452.2 g, what masses of CaCl2 and water should be used?
What is the reaction that occurs with hexanal and propanol (give both the hemiacetal and acetal products)?
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