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N2H4(l ) + O2(g) -> N2(g) + 2 H2O(l ) H = -622.2 kJ
Calculate the heat of reaction for the same reaction where water is a gaseous product instead of a liquid. Hf H2O(g) = -281.8 kJ/molHf H2O(l) = -241.8 kJ/mol
A certain element consists of two stable isotopes. The first has atomic mass of 7.02 amu and a percent natural abundance of 92.6%.
A buffer is made by dissolving HC2H3O2 and NaC2H3O2 in water. Write an equation that shows how this buffer neutralizes added: Acid, Base
Calculate the molarity of the solution at the limit of detection if the molecular weight of THC is 315 g/mol
Sodium peroxide used to remove carbon dioxide from the air supply in space crafts. it works by reacting with the co2 in the air to produce sodium carbonate and O2.
determine the mechanism for the synthesis of p-nitroacetanilide from acetanilide and hno3 nitric acid and h2so4
2 students are titrating and started the titration at 30.0 mL. The buret was at 49.50 mL and the solution still had not chnaged to the base color. They stopped, now at 49.80 mL and refilled the buret to 0.00 mL and continued to titrate.
What is the concentration of a solution made by diluting 75 mL of 6.0 M HCl to a final volume
The choice of precipitating reagent is important. Briefly explain what the consequences would be if excess 6M NaOH solution instead of 6M NH3 solution were used to separate Fe3+ and Al3+ ions from Ca2+, Cu2+,
calcuate the number of moles of HCI and of NaOH present when mixing 50.0mL
2HCrO4 ^- Cr2O7 ^2- + H2O Determine concentrations of Dichromate ion and Bichromate ion if we add .1mol/L of bichromate ion and no dichromate ion once reaction reaches equilibrium.
What chemical tests might be used to distinguish between pentanal and 2- pentanone; between benzyl alcohol and diphenylmethanol?
Write the equation for the formation of the precipitate in the test tube containing the saturated solution of calcium hydroxide.
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