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If 0.7438 g of potassium hydrogen phthalate is used and the equivalence point occurs at 33.00 mL of NaOH, calculate the molarity of the NaOH solution to the correct number of significant figures.
A buffer that contains 0.49 M of the base, B, and 0.29 M of its conjugate acid, BH+, has a pH of 8.10. What is the pH after 0.0025 mol HCl is added to 0.25 L of this solution
An aqueous solution containing 35.0% by mass of an unknown covalent compund in water was found to have a freezing point of -3.5 deg C. Calculate the molar mass of the unknown compund.
The mass spectrum of an organic compound shows the relative abundances of M to be 67.98% and M 1 to be 15.44%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound.
Calculate the molar mass of a vapor that has a density of 1.88 g/L at 25.2 oC and 710. mmHg.
Calculate the concentrations of all species at equilibrium for each of the given original mixtures. 1.2 mol of NOCl and 1.2 mol of NO in a 1.0-L flask? K = 1.6*10^-5 mol/L
The aspirin componet weighs only 250mg. What is the w/w% aspirin inthe time release tablet?
How many carbon dioxide in kilograms is produced upon the complete combustion of 18.9 L of propane(Many home barbecues are fueled with propane gas
15 g of steam at 373 K is added to 250 g of H2O (liquid) at 298K at onstant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate changes in entropy for the process.
If 2 new elements have been discovered and one is R, a new element from the family with 3 valence electrons and Z, a new element from the family with 6 valence electrons. Write the formula for the binary compound between element R and element Z.
An unknown Cu2+ sample gave an absorbance of 0.262 in an atomic absorption analysis. Then 1.00 ml of solution containing 100.0 ppm Cu2+ was mixed with 95.0 ml of the unknown, and mixture was diluted to 100.0 ml in a volumetric flask.
aluminum block and that the alcohol vaporizes at 25 degree Celsius). Heat of vaporization of the alcohol = 45.4 kj/mol at 25 0C
Iodine Trichloride, ICl3, will react with a chloride ion to form ICl4 negative. Identify the Lewis acid and Lewis base. Use arrows to show movement of the electrons in the formation of the product.
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