Define what is the freezing point of a solution

Reference no: EM13173403

1. The thermal decomposition of potassium chlorate can be used to produce oxygen in the laboratory: 2 KClO3(s) â†' 2 KCl(s) + 3 O2(g). What vollume (in L) of O2 gas is produced by the decomposition of 7.5g of KClO3(s) at a temperature of 25 °C and a pressure of 1atm?

2. Which of teh following gases would have the highest average molecular speed at 25 °C?

(a) O2
(b) N2
(c) CO2
(d) CH4
(e) SF6

3. What is the freezing point of a solution prepared by dissolving 11.3g of Ca(NO3)2 in 115g of water? (The molal freezing point depression of constant water is 1.86 °C/m).

4. Both of the molecules n-Pentane and Neopentane have the same molecular formula (C5H12), but n-Pentane has a higher boiling point. Which statement below best describes why n-Pentane has the higher boiling point?

(a) n-Pentane exhibits hydrogen bonding.

(b) Neopentane exhibits hydrogen bonding.

(d) Neopentane molecules have stronger dipole moments than n-Pentane molecules.

(e) London Dispersion Forces on Neopentane are greater than on n-Pentane.

Reference no: EM13173403

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