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How many grams of H2O are produced when 5.00 moles of oxygen are used?
A mass spectrometer computed the atomic mass ratio of fluorine to carbon - 12 as 1.5832 - to - 1 . If the atomic mass of carbon - 12 is 12 u ( exactly ) , what is the atomic mass of fluorine in u ?
Natural boron is composed of two isotopes: 19.78% boron-10 (atomic mass = 10.0129 amu) and 80.22% boron-11 (atomic mass = 11.0093 amu). What is the average atomic mass of naturally occurring boron?
Calculate the ratio of ionized and non-ionized forms of scopolamine drug in the stomach (pH = 1.66) and intestine (pH = 8.66) if its pK = 7.66. Where will the drug be absorbed: in the stomach and/ or intestines?
Calculate the ratio of ionized and non-ionized forms of scopolamine drug in the stomach (pH = 1.66) and intestine (pH = 8.66) if its pK = 7.66. Where will the drug be absorbed: in the stomach and/ or intestines?
1. Determine the boiling and freezing point of a 0.10 molal aqueous NaCl solution.
2. A solution is prepared by dissolving 27g of urea, (NH2)2CO, in 100g of water. Calculate the boiling and freezing point of the solution. Urea is a nonelectrolyte.
3. How many grams of table salt must be added to half a liter of water to raise its boiling point by 15°C?
4. How many grams of table salt must be added to half a liter of water to lower its freezing point by 10°C?
A solution was prepared by dissolving 18.00g of glucose in 150.0g of water. The resulting solution was found to have a boiling point of 0.34°C higher than its pure solvent boiling point at 1 atm. Calculate the molar mass of glucose. Glucose is a molecular solid that is present in individual molecules in solution.
Compute the weight (g) of solute needed to make the solution listed below:
a. 0.500L of 9.25N K2SO4
1. An aqueous solution of hydrofluoric acid is 12.5 molal with respect to HF and has a density of 1.070 g/mL at 25oC. Calculate:
a. mole fraction of HF
b. %w/w of HF
c. molarity
d. molality.
e. mole fraction of HF
A sample of a compound containing carbon and oxygen have a mass of 88grams.Experimental procedures showed that 24 g of this sample was carbon and the remaining 64 g was oxygen. What is the percentage composition of this compound. Show the solution.
