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Calculate the pH at the equivalence point for the titration of 0.120 M methylamine (CH3NH2) with 0.120 M HCl. The Kb of methylamine is 5.0× 10-4.
According to the above expression how many moles of KHC8H4O4 are needed to neutralize 25.00 mL of 0.10 M NaOH
Using appropriate equations, explain why combustion of fuels containing sulfur leads to acid rain.
A buffer solution is made by dissolving 0.4832 g NH_3 and 1.1032 g NH_4Cl in 250.0 mL water. then 25mL of .0500 M NaOH is added to the buffer solution
Some observations through an experiment shows that a gas sample of 115 mili litres has a mass of 0.170 grams at a pressure of 711mmHg and a temperature of 34 degree celsius. Determine the molar mass of the gas.
a stock solution containing cobalt ions was prepared by dissolving 393 grams of pure cobalt metal in nitric acid and diluting to a final volume of 8.75 L. Determine the concentration of the stock solution.
A 2.9 m solution of methanol (CH3OH) in water has a density of 0.984 g/ml. What are the a) mass percent, b) molarity, and c) mole fraction of methanol in this solution?
A technician was accidentally exposed to potassium-42 while doing some brain scans for possible tumors. the error was not discovered until 48h later when the activity of the potassium-42 sample was 2.1?ci .if potassium-42 has a half-life of 12 h
calculate the kg mix- ture from the mixer, kg water evaporated, and kg jam produced.
What is the origin of the charge neutrality requirement in solids? Why must solids have charge neutrality in the bulk,
A solution, made by dissolving 62.07 g of a nonelectrolyte in 500 g of H2O, exhibits a freezing point of -1.86 °C. Determine the molecular weight of this nonelectrolyte compound? For water Kf = 1.86 °C m-1Kb = 0.51 °C m-1
The double-replacement reaction below results in the formation of the precipitate lead chloride. Balance the equation and write the net ionic equation.
the mass of component A is 2.47 g, component B is 1.12 g, and component C is 0.654 g; what is the percent composition of component A?
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