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What are the freezing point and boiling point of 0.20 m glycerol in ethanol?
What is the freezing point of 2.04 g KBr and 4.84 g glucose in 189 g of water?
What is the composition in mole fractions of a solution that has a vapor pressure of 33 at 20
0.5865 g sample of lactic acid (HC3H5O3) is burned in a calorimeter whose heat capacity is 4.812 kJ/ oC. The temperature increases from 23.10oC to 24.95oC.Calculate the heat of combustion of lactic acid a. per gram b. per mole.
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 7.00 nm in diameter? Take the mass..
Suppose a nearby storm passage causes the wind speed in the town to suddenly increase to 10.0m/s. What is the carbon monoxide concentration one hour later?
An aqueous solution of methylamine (CH3NH2) has a pH of 10.68. How many grams of methylamine are there in 100mL of the solution
Isotopes of elements are atoms of the same element that vary in the: 1,number of electrons associated with the nucleus. 2,number of neutrons in the nucleus. 3,number of atoms in a molecule. 4,number of protons in the nucleus.
If in a decompositionreaction, one sample of magnesium fluoride produced 1.66kg of magnesium and 2.58kg of fluorine. A second sample produced 1.27kg of magnesium.How much fluorine (in grams) did the second sample produce
The optical rotation of a sample composed of only D-lactose is determned [a] abs = 0.99 degrees. [a]d is known to be 52.3 degrees of D-lactose.
An object made of aluminum has a mass of 8.37g. When it was placed in a graduated cylinder containing 20.0mL of water, the water level rose to 23.1mL. Calculate the density and specific gravity of the object.
Calculate the current (mA) required to deposit 0.89g of tungsten metal in 45 minutes from a solution of WO42-. (Atomic weight: W=183.8)
Given a 400mg sample of Thorium 231 decomposes via beta emission with a half life of 25.5hours, how long would it take,in day, for the sample to deca down to 25mg
how many cans of Mountain Lightning would an individual have to drink to die from a tartrazine overdose If the LD50 of tartrazine in humans is supposed to be 12,750 mg/kg (as it is for mice) and the average human weighs 70 kilograms,?
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