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The content of manganese in steel was found using atomic absorption and the method of standard additions. A standard solution of manganese containing 95.5 ppm Mn was prepared for the analysis. The steel sample was dissolved in dilute nitric acid, placed in a volumetric flask, and diluted to 100.0 mL. When this sample was introduced into the spectrophotometer, the light absorbed was indicated by an absorbance of 0.185. A second sample for analysis was prepared by pipeting 5.00 mL of the standard Mn solution and 50.0 mL of the steel sample into a 100.0 mL volumetric flask and diluting to 100.0 mL. The light absorbed by this sample was indicated by an absorbance of 0.248. Calculate the concentration of manganese in the original 100.0 mL of the dissolved steel.
a the following surface tension were measured for aqueous solutions of the nonionic surfactantch3ch29och2ch25oh at
What is the strongest attractive force that must be overcome in order to do the following: a) melt pure solid phosphorus pentachloride b) boil pure liquid selenium tetrafluoride c) boil pure liquid methanol (CH3OH) d) sublime pure solid carbon dio..
Suppose you have a sample of sodium weighing 11.50 g. How many atoms of sodium are present in the sample? What madd of potassium would you need to have the same number of potassium atoms as there are sodium atoms in the sample of sodium.
Give the structure of the sodium salt of methyl salicylate and in the second part of the experiment, what is the structure of the anionic form of salicylic acid before it is acidified with the dilute sulphuric acid?
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
Determine the pH of the solution containing 8*10^(-3) M each of HF and NaF. Assume that NaF dissociates completely. Acid Dissociation constant for HF is Ka=6.3*10^(-4).
A solution is prepared by dissolving 0.60g of nicotine in water to make 12mL of solution. The osmotic pressure of the solution is 7.55atm at 25 degrees C
question a gas is compressed at a constant pressure of 0.270 atm from a volume of 8.00 l to 5.00 l. in the process 400
If a salty crude sample was analyzed to have 110.6 ppm salt, calculate the pounds of salt per 1000 bbls of crude
Suppose you wanted to heat a mug of 250. mL water from room temperature, 25°C, to 100°C to make a cup of tea. How much energy (in joules and in calories) would you need from your microwave.
What is the boiling point of water at an altitude where the ambient air pressure is 0.61 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.
Draw the Newman projection formulas for CH3CHBrCH2CH3 and sketch the potential energy versus rotation diagram for a 360o rotation of 2-bromobutane along C2 and C3 carbon atoms.
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