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A mineral oil has a density of 0.875g/cm^3. Suppose you spread 0.65g of this oil over the surface of water in a large dish with an inner diameter of 21.6 cm. How this is this oil layer? Express the thickness in centimeters.
how many water molecules are in one cell? This can be a rough calculation, using a water density of 1g/mL and 3x10-23g as the mass of one water molecule
Urea (NH2CONH2) an important nitrogen fertilizer is produced industrially by the reaction 2NH3(g)+CO2(g)--->NH2CONH2(aq)+ H2O(l) given that ?G^degree = -13.6KJ, calculate ?Gat 298K for the following sets of conditions
The value of deltaH for the reaction CH3OH (l)---->CO (g) +2H2 (g) is +128.1 kJ? How many kJ of heat are consumed when 5.10 g of co (g) is formed as shown in the equation
Platinum crystallizes in a face-centered cubic lattice (the Pt atoms are at the lattice points only). If the density of the metal is 22.3 g/cm3, what is the unit cell edge length in pm
Describe the preparation of 1 liter of a 0.75M acetate buffer, pH 4.50, starting from a 1.50 M solution of acetic acid and solid KOH pellets, M.W.=56 (pKa=4.75)
A 25.0 mL sample of 0.150 M nitrous acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of nitrous acid is 4.50 x 10-4.
A glucose molecule is labeled at carbon-3 with 13C. How many turns of the citric acid cycle are required to remove the carbon as CO2?
Because of increasing evidence of damage to ozone layer,CFC production was banned in 1996.However, there are 100 million auto air conditioners that still use CFC-12(CF2C12) These air conditioners are recharged from stockpiled supplies of CFC-12.
Calculate the pressure in the flask in atmospheres and torr also If the sealed-tube manometer in had a height difference of 20.0 inches between the Hg levels?
Explain and calculate the mass of solution in a pipette if the following data has been recorded during a lab experiment
What is the concentration of CO in molecules per cubic meter?
The following data on the infrared absorption wavenumbers ( wavenumbers in cm- 1) of molecules are taken from Spectra of diatomic molecules, G. Herzberg, van Nostrand ( 1950):
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