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0.7180 ± 0.0002 g of KNO3 was added to 100.00 ± 0.02 g of H2O in a solution calorimeter.
(a) Calculate ?Hrxn if Csystem = 121.46 ± 1.23 cal/°C and ?T = -0.508 ± 0.009 °C.
(b) Calculate the error in ?Hrxn.
(c) Calculate the molar enthalpy change ?H~rxn for the dissolution of KNO3 in water.
(d) Calculate in the error in ?H~
Acetone (CH3)2CO, has a larger dipole moment than water, but NaCl will not dissolve in it.
Devise a plan to calculate the mass of air that was contained in the clean dry stoppered flask, using the mass measurements you will make during the experiment. the calculation will require another density value besides the density of air.
Write a net ionic equation for the reaction between aqueous solutions of ammonia and hydrofluoric acid.
Calculate the concentrations of each of the ions in 0.12 M (NH4)2HPO4. a) [NH4+], M b) [HPO42-], M
Why is it particularly important to wash the cupric hydroxide intermediate in the synthesis of cupric acetate (verdigris)? Be specific about what is being removed and why it matters.
Calculate the apparent molecular weight of the unknown hydrocarbon on the basis of the freezing-point depression experiment.
The stilbene molecule has seven double bonds, yet in this reaction, only one of them undergoes addition with the Br2 generated in the reaction mixture. What functional group(s) is(are) the other six bonds in, and what can you say about the reactiv..
if two atoms of element A react with three atoms of element B, what is the chemical formula for the resulting compound
How many grams of Na2CO3 are present in 29.7 mL of a 31.0% Na2CO3 solution. The density of the solution is 1.09 g/mL.
Benzene (A) melts at 6 0C and diphenylmethanol (B) melts at 65 0C. The solids are mutually immiscible. There is a eutectic at 1 0C, the eutectic solution being 20 mol % in B, and an unstable compound, AB2,
KHP is an acid that is monoprotic and hardly hygroscopic. When carbon dioxide reacts with NaOH it produces sodium carbonate. I kind of understand how to do part b but i really don't understand how to do part a.
Carbon-14 decays with a half-life of 5730 years. What is the first order rae constant for its decay in units of years^-1
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