Question

A ten gallon methane tank contains 1.243 mol of methane at 74°F. Express the volume of tank in liters, the amount of methane in the tank in grams, and the tempature of the tank in kelvin.

Answer 1

First, convert 74F to celsius. Convert 10 gallon to liters. Use google to do this if you don't have the conversion factor.
grams = mols x molar mass
Kelvin = 273 + C

Answer 2

296