Physical Chemistry Answers

Dear Sir
Greetings
Please, how to compute the vibration frequency of a molecule of more than two atoms….
The equations?
Regards
Farid Fahim

Paraffin wax has a melting point of 60oC, and carnuaba wax has a melting (range, really, but, in general) point of 80oC.

If I heat paraffin wax to 80oC, and pour a thin layer directly on skin, there is no burn. If I pour a thin layer of 80oC carnauba wax directly on skin, the skin is likely to acquire a 1st or even 2nd degree burn.

What thermal property of these waxes is the most likely culprit for this difference?

Paraffin wax is made up entirely of alkanes of various lengths (average is C25); carnauba wax is mix of alkanes with a high percentage of fatty acids and fatty alcohols, and some esters (specific percentages varies).

Question 20 : Standard temperature and pressure (STP) refers to which conditions?
273 k and 1 atm
0 K and 1 KPa
(b) 0 K and 1 mmHg
0 K and 1 atm

Question 12 : A container with volume 71.9 ml contains water vapor at a pressure of 10.4 atm and a temperature of 465oC. How many grams of the gas are in the container?
0.183 g
0.222 g
0.129 g
0.421 g

Question 9 : The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is __________ M. The density of the solution is 1.3 g/mL.
6.3
3.7
6.8
0.11

The mole fraction of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g of Ne is __________.
0.11
1.5
0.6
0.2

Question 18 : A container with volume 71.9 ml contains water vapor at a pressure of 10.4 atm and a temperature of 465oC. How many grams of the gas are in the container?
0.421 g
0.129 g
0.222 g
0.183 g

At room temperature and pressure, a sample of a gas has a volume of 2.4 L. The pressure decreases, and the volume of the gas doubles. What is its new volume in milliliters? Do not use scientific notation in your answer.

The equivaent of 25^oC in Kelvin scale is
258K
298K
238K
278K

What is a diatomic molecule?