3.41 Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C<sub>9</sub>H<sub>10</sub>O. (a) Calculate the percent composition by mass of C, H and O in cinnamic alcohol. (b) How many molecules of
7.33 Careful spectrum analysis shows that the familiar yellow light of sodium lamps
(such as street lamps) is made up of photons of two wavelengths, 589.0nm and 589.6nm.
What is the difference in energy (in joules) between photons with these wavelengths?
5.29: A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32<sup>o</sup>C exerts a presure of 4.7 atm. Calculate the number of moles of gas present. Answer: moles of nitrogen gas(n) = [4.7atm x (2.3L/K(mol)] / [(.0821