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A 25.0 mL sample of 0.20 mol L-1 HNO2(aq) is titrated with 0.20 mol L-1 KOH(aq) at 25oC. What is the pH AT THE Equivalence point?(FOR HNO2,Ka=4.50x10^-4 at 25oC)
A 25.0 mL sample of a 0.115 M solution of acetic acid is titrated with a 0.144 M solution of NaOH. Calculate the pH of the titration mixture after 10.0, 20.0, and 30.0 mL of base have been added.
Three gases (8.00g of methane, , 18.0g of ethane, , and an unknown amount of propane, ) were added to the same 10.0L- container. At 23.0 degrees Celcius , the total pressure in the container is 5.40atm . Calculate the partial pressure of each gas ..
Propose a mechanism for the following reaction. Be sure to show all the steps and the reactive intermediates
list three acid, bases, and salt commonly used in therapeutic processes.
The "roasting" of 48.7 g of ZnS at constant pressure gives off 220. kJ of heat. Calculate the DH for this reaction. 2ZnS(s) + 3O2(g) ® 2ZnO(s) + 2SO2(g)c
What is the molarity of a 600mL solution prepared by dissolving 6.72 g of sulfuric acid, H2SO4
a compound with empirical formula c2h2n dissolved its 0.0800 gram in 10.00 g of c6h6 freezing point of resulting
After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 19.0732 g. Assuming that only the magnesium carbonate had decomposed, how much magnesium carbonate was present in the original sample
What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.518g/L at 25 ?C and 721
The substance CS2 has a melting point of -110.8°C and a boiling point of 46.3°C. Its density at 20°C is 1.26 g / cm3. It is highly inflammable. a.)Name this compound.
The following reaction equation depicts the reaction between hydrazine (N2H4) and dinitrogen textroxide (N2O4) to form diatomic nitrogen and water vapor.
A 500 ml volume of helium gas is at a pressure of 750 mm Hg and has a temperature of 30 degrees celcius. What is the volume of the same gas at STP?
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