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A quantity of 1.922g of methanol (CH3OH) was burned in a constant -volume bomb calorimeter. consequently, the temperature of the water rose by 4.20degree centigrade.
If the balloon is filled with 2.0L of helium at sea level, is released and rises to an altitude at which the atmospheric pressure is only 500mm Hg, will the balloon burst?
A 0.0100 g sample of Co(NH2CH2CH2NH2)3Cl3 is dissolved in 25.0 mL of water and the osmotic pressure of the solution is 87.9 mmHg at 25 degrees Celsius. How many moles of ions are produced per mole
A lead storage battery needs sulfuric acid to function. the recommended minimum concentration of sulfuric acid for maximum effectivity is approximately 4.8M A 10 ml sample of battery acid requires 6
A helium-filled balloon of the type used in long-distance flying contains (1.3 107 L) of helium. Let us say you fill the balloon with helium on the ground where the pressure is 709 mm Hg and the tem
The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule
A cube of solid benzene (C6H6) at its melting point and weighing 8.37 g is placed in 19.3 g of water at 38.8 °C. Given that the heat of fusion of benzene is 9.92 kJ/mol, to what temperature will
An unknown solid salt is dissolved in water to form a solution. Describe one chemical and one physical way that the salt could be separated from the water.
When another 1.00g sample of ascorbic acid is diddolved in 10.0g of water the freezing point of the solution is -1.06C. At this temperature the dissociation of ascorbiacid is negligible.
At the end of an experiment with a radioactive element, 1.90 ng of the element remained. If 3 half lives passed, how many ng of the element were originally present?
Here are the enthalpy changes when one mole of HCl gas is added to various moles of water: -16.608 Kcal for 10 mol, -17.272 Kcal for 25 mol, -17.453 Kcal for 40 mol, -17.735 Kcal for 200 mol, -17.96
A 1Kg non-stretched balloon fabric on the ground (P0= 1 bar) is attched to a 2Kg payload. One Kg of helium is places in the balloon. How many pounds of restraint are needed to keep the assembly teth
An irregular piece of metal that has a mass of 14.28 grams is placed in a graduated cylinder that contains 20.0 mL of water. The water level rises to 21.8 mL. What is the density of the solid?
Freon-12, CF2Cl2, which has been widely used in air conditioning systems, is considered a threat to the ozone layer in the stratosphere. Calculate the root-mean-square speed of Freon-12 molecules in
If 3.90 mole of nitrogen gas is mixed with 11.9 moles of hydrogen gas, which reactant is in excess? Determine the amount of excess that is left over and does not react?
Sketch the liquid vapor phase diagram for a mixture of two liquids that shows a significant negative deviation from Raoult's. Distillation of such a mixture though a very long column would produce
When selecting the appropriate wavelength and bandwidth for a spectrophotometric analysis, the bandwidth should be as large as possible but small compared with the band being measured. Why?
The absorbance of a 2.13 x 10-4 M solution of a compound is 0.723 at 385 nm in a 10.00 mm cuvet. What is the sample's percent transmittance?
A reference standard prepared by dissolving 5.4 mg of a transition metal coordination compound in 40 mL of water transmits 36.3 percent of incident light at 532 nm. Assuming that Beer's Law is valid
What is the magnitude and sign of the molar heat of vaporization of butane? Explain your reasoning using Hess's Law. is your sign for the heat of vaporization realistic? Explain.
60.0g liquid nitrogen(boiling point -196 celcius) is poured in a styrofoam cup containing 200g of water at 55.3 Celcius. Calculate the molar heat of vaporization of liqiud nitrogen if the final tem
Calculate the absolute standard deviation for the value 17.26% if this value was obtained from the following data: weight of barium sulfate collected = (56.8361 +/- 0.0001g - 51.0915 +/- 0.0001g), w
What should be the concentration of the sodium thiosulfate solution in order that each mL of the solution correspond to exactly 10 mg of the hydrogen peroxide solution?
How many types of molecules with different masses exist in a sample of chlorine gas if the sample exists entirely as diatomic molecules?
The difference in pathlength traveled by the incoming and outgoing rays from a diffraction grating is 750 nm. If there was third order diffraction, at what wavelength would constructive interferenc