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A 0.481 gram sample of an unknown acid (HX) required 28.95 mL of 0.2103 M NaOH for neutralization to the phenolphthalein end point. What is the molar mass of the acid? If the unknown acid had the formula H2X, could this experiment be used to determine its molar mass? Explain why or why not?
A solution of ethanol (C2H5OH) in water is prepared by dissolving 72.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 300.0 mL of solution. What is the molarity of the ethanol in this solution?
Calculate the CO3- concentration of a 5.45 x 10-4 M H2CO3 (carbonic acid) solution. Ka1 and Ka2 of carbonic acid are 4.3 x 10-7 and 4.8 x 10-11 respectively.
In the coal-gasification process, carbon monoxide is converted to carbon dioxide via the following reaction:
In an adiabatic compression if one mole of an ideal gas with a Cv=5R/2, the temperature rises from 293 K to 325 K. Calculate the heat, work, change in enthalpy and change in internal energy
degress C in boling water and then dropped the hot coins into 43.0 g of water at a temperature of 15.5 C in a coffee cup calorimeter. The final temperature of the water and the coins was 21.5 C.
suppose that a cars starter draws 225A of current for 6.3 s to start the car. what mass of Pb is oxidized in the lead-acid battery to supply the electricity?(in grams)
Calculate the final temperature of 32 mL of ethanol initially at 11 degrees C upon absorption of 562 J of heat.
A gas sample has an original volume of 760 ml when collected at 720 mm and 25degC. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 30degC?
what is the pH of the hydroflouric acid solution prior to adding sodium fluoride? (b) how many grams of sodium fluoride should be added to prepare the buffer solution? Neglect the small volume change that occurs when the sodium fluoride is added.
If you used 20 mL of solvent for recrystallization, how much B would be expected to be in the crystallized material. What is the ration of A:B in the crystalized material
calculate the minimum volume of 1.00M HCL required to react completely with 5.00g of Ca ?
What is the reaction order with respect to each reagent for the following reaction. Then write the rate law equation.
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