Answer to Question #195924 in General Chemistry for Muchafara Makonye

Question

i. Calculate the amount of nitric acid in terms molarity and in terms of number of moles 

ii. Differentiate molarity and number of moles.

3. A 0.010 mol sample of barium nitrate formed was heated until it had completely decomposed according to the following balanced equation:

2Ba (NO3)2(s) ˗˗˗˗˗˗˗˗˗˃˃ 2 BaO(s) + 4 NO2 (g) + O2(g)

a) Use the ideal gas equation to calculate the total volume, cm3, of gaseous products obtained at 387 K and 1.12 × 105Pa.

b) The Kinetic Theory of gases is an attempt to explain the properties (behaviour) of ideal gases. What assumptions (at least three) does this theory make about gas molecules?

Answer 1

i)0.0155M

ii)The primary difference between the two comes down to mass versus volume. The molality describes the moles of a solute in relation to the mass of a solvent, while the molarity is concerned with the moles of a solute in relation to the volume of a solution.

3a)Total Volume =560cm3

b)(1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size;

(2) the molecules undergo perfectly elastic collisions (no energy loss) with each other.