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 8.35x10^-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.

If a balloon has a volume of 1.364 L at a temperature of 27.7 C°, what will be the volume (L) of the balloon if the temperature is increased to 48.3 C°?

Give your answer to four significant figures.

What is the hybridisation on the carbon atom circled in the amino acid alanine drawn below?

What is the hybridisation on the carbon atom circled in the amino acid alanine drawn below?

From the options below, choose the statement which most accurately describes a 'double bond'.