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The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.6. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.60 M B(aq) with 0.60 M HCl(aq).(a) before addition of any HCl (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of HCl (d) after addition of 100.0 mL of HCl
What will be the average atomic mass of element A if percentage abundance of these two isotopes are 48.17 % and 51.83 % respectively. ?
A 0.5078g sample of impure nitrobenzene was treated with 1.044g of tin. when the reaction was complete, the residual tin was found to weight 0.338g. Calculate the percentage of nitrobenzene in the sample.
How much heat is lost when a 640 g piece of copper cools from 375 oC, to 26 oC? (The specific heat of copper is 0.387 J/g . oC)
How many moles of I2 were used in the titration? How many moles of SO2 were in the 5.00 mL sample of wine? Determine the mass of SO2 (in mg) in the 5.00 mL sample of wine. Determine the concentration of SO2 (in mg/L) in the wine.
A certain organic compound was burned, producing 1.481 g of CO2 and 0.303 g of H2O. The mass of the original sample was 0.438 g. What is the empirical formula of the compound?
Chemical Structure and Hydrogen Bonds in Base Pairs, Draw the chemical structure of a correctly base paired G-C pair, then re-draw the pair with a propeller twist these answers should all be on one page following box G.
The temperature of Beaker X = 75°C and the temperature of Beaker Y = 50°C after Five minutes . determine the temperatures be after another 5 minutes have passed?
A gas occupies 14.5L at a pressure of .526 atm. What is the volume when the pressure is increased to .780 atm?
What statement in incorrect about the following pairs of sugars? Galactose and mannose are diastereomers
A sample of 1.42 g of Helium and an unweighed quantity of Oxygen are mixed in a flask at room temperature. The partial pressure of Helium is 42.5 torr and of oxygen is 158 torr.
Using the formula W = mg, how many milliliters of water with a density of 1g/mL are required to weigh 0.75 newtons and g = 9.81 m/s2?
at constant volume, the initial pressure of a substance is 0.63 atm and the initial temperature is 283 k.calculate the pressure of the substance at 295 k.
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