General Chemistry Answers

Determine the boiling point of a 2.00 molal solution of potassium bromide, KBr. 

Calculate the molar mass of a nonelectrolyte if 40.0 grams of it dissolved in 200.0 grams of water lowers the freezing point to – 1.40 ° C.

Determine the Molarity of a solution made by dissolving 21.6 grams of sodium carbonate, Na₂CO_3, in enough water to make 400.0 ml of solution.

Calculate the pressure in a 212 Liter tank containing 23.3 kg of argon gas at 25°C? ( atomic weight Ar - 40 )

Calculate the pressure in a 212 Liter tank containing 23.3 kg of argon gas at 25°C? ( atomic weight Ar - 40 )

For each of these pairs of half-reactions, write a balanced equation for the overall cell reaction and calculate the standard cell potential, E^0cell.

A. Half-reactions: Cd^2+(aq) + 2e^- —> Cd(s) Cr^2+(aq) + 2e^- —> Cr(s)

Cell reaction:

E^0cell

B. Half-reactions: Fe^2+(aq) + 2e^- —> Fe(s) Br2(g) + 2e^- —> 2Br^-(aq)

Cell reaction:

E^0cell

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A sample of the transition metal scandium contains 7.42 x 10²¹ atoms. How many moles does the sample contain?

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Some students believe that teachers are full of hot air. If I inhale 2.20 litres of gas at a temperature of 18 degrees c and it heats to a temperature of 38 degrees c in my lungs, what is the new volume of the gas