Describe the spectrum you would observe for the absorption spectrum of elemental hydrogen gas

The emission spectrum for hydrogen gas are red, blue-green, blue-violet and violet so I believe the absorption spectrum would be the same and these are given off when a glass that has hydrogen gas is passed through with an electric current at low pressure and it gives off blue light which when passed through a prism is broken down into the above light colors.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"