A molecule emits light a photon with an energy of 8x10^-19 J.  What is the wavelength in metres of this photon?

Speed of light is 3.00 x 10⁸ m s^-1.  Planks constant is 6.626 x 10^-34 J s.

Give your answer to 3 significant figures. Do not enter units!

Name the following molecule: ClF₅

A micro-syringe used in gas chromatography has a maximum volume of 50 mL. A chemical reaction known to generate methane gas is sampled using the syringe twice. The first sample with a volume of 10.0 mL was determined to contain 7.34x10^-7 moles of methane gas. If a second sample of 25.0 mL was taken, with the reaction at the same temperature and pressure, how many moles of gas are in the 25.0 mL sample?

Enter your answer to 3 significant figures using scientific notation - for example, 1.23E-4 represents 1.23x10^-4.  Do not enter units.

In the early morning when the temperature was 12.3 ^oC, a motorist measured her tyre pressure at 184 kPa. By noon the temperature in the tyres had reached 34.1 ^oC. What was the pressure (in kPa) in the tyres at noon assuming there was no change in volume?

Give your answer to three significant figures.

If a balloon has a volume of 1.949 L at a temperature of 14.2 C°, what will be the volume (L) of the balloon if the temperature is increased to 64 C°?

Give your answer to four significant figures.