Chemistry Answers

Find ΔE

   a. when 175 J of work is done on a system that evolves 50 J of heat to the surroundings

   b. when a gas absorbs 28 kJ of heat and has 13 kJ work done on it

Give two examples (structures) only on 2π, 6π and 10π electron compounds. Show why the compounds are aromatic using the molecular orbital diagram

The number of moles of sulphuric acid that is required to react with all of the the barium chloride is: 

The tons of limestone(CaCO3) needed for the preparation of 5 tons of lime (CaO)

Equal volumes of 0.3 M NaNO3 and 0.8 M Ca(NO3)2 solutions are mixed . What is the molar concentration of of nitrate ions in the mixture?

Show your solution:A soda mint tablet contains NaHCO3 as an antacid. One tablet requires 30.5 mL of 0.135 M HCI for complete reaction. Determine the number of grams of NaHCO3 that one tablet contains. The chemical equation for the reaction is:

NaHCO (s)+HCI (aq)- NaCI (aq)+CO2 (g)+ H2O (I)

Calculate the mole fraction of the solute in the following solutions.

a) 100g C2H6O in 100g H2O

b) 30% HCI solution by mass

Calculate the mole fraction of the solute in 30% HCL solution by mass

Polyatomic Molecule - Examples, Types, Classification and Properties

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