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The atomic weight of a newly discovered el- ement is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a per- cent abundance of 41.7%. What is the mass of the second isotope?
A 50.0 mL sample of 0.40 M benzoic acid, C6H5COOH, a weak monoprotic acid, is titrated with 0.48 M NaOH. Calculate the pH at the equivalence point. Ka of C6H5COOH = 6.5 10-5
Assuming that 0.5 grams of a 1.0 gram sample is CaCO3, what should the concentration of HCl (M) be if you want to use 25.0 mL for the titration
Determine the partial pressure of oxygen O2 If the total pres- sure =80 torr, the partial pressure of CO=330 torr and the CO2 has a partial pressure = 330 torr?
A 100ml sample of sodium bromide containde co104.62g of sodium bromide. upon evaporation, 6.280g of reside was obtained. frome this data calculate each of the folowing for the solution; a density of the solution
in photosynthesis plants use energy from the sun in combination with carbon dioxide and water to form glucose c6h12o6
The normal melting points and boiling points of xenon are -112 deg. Celsius and -107 deg. Celsius, respectively. The Xe triple point is at -121 deg. Celsius and 282 torr, and its critical point is at 16.6 deg. C and 57.6 atm.
The vapor pressure of ethyl ether is 7.87 in. Hg at 2°C; 11.8 in. Hg at 12°C; 27.5 in. Hg at 32°C; 29.9 in. Hg at 35°C; 39.3 in. Hg at 42°C. What is the normal boiling point of ethyl ether
Explain the significance of a horizontal line connecting point on the lower curve with a point on the upper curve
A solution of nacl in water was electrolyzed with a current of 2.50 amps for 15.0 min. How many millimeters of 0.100m hcl would be required to neutralize
At a certain temperature, the solubility of strontium arsenate, Sr3(AsO4)2, is 0.0690 g/L. What is the Ksp of this salt at this temperature
Calculate the pH of a buffer solution made by mixing 49 ml of a 0.07 M ammonia solution with 52 ml of a 0.10 M ammonium nitrate solution. Give the pH to two decimal places.
Dibenzalacetone is commonly used in sunscreens. Suggest what properties are valuable in a compound for use as a sunscreen.
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