Gas is typically measured in cubic feet or cubic meters at a particular temperature and pressure and will depend on the composition of the gas. So, as asked, there is no answer.
I have rephrased your question: What is the expected weight of natural gas at standard condition in a one US gallon container?
Answer: 0.00588 to 0.007487 pounds
Standard conditions are pressure = 14.7 psia and temperature = 60 degrees F. At these conditions, natural gas gravity = 0.7 to 0.9 kg/m3 at standard conditions, depending on composition. See first link. This is equal to 0.044 to 0.056 pounds per cubic feet. There are 7.48 gallons in a cubic foot, so:
0.044 pound/cubic feet *(1 cubic foot/7.48 gallons) = 0.00588 pounds
0.56 /7.48 = 0.007887 pounds
see links
1 gallon of propane gas weighs 4.2 pounds.
typical vx beetles weigh 1,200 lbs. with 1/2 tank of gas. at least my 68 does :-)
They weigh about 1 ounce !
6
One gallon has 128 fl. oz.
the weigh 1-7 ounces
You cannot weigh an area. Just as you cannot weigh a distance. (How much does one centimeter weigh?)
Quartz weigh about 1 and a half pounds
Ladybugs weigh like 1 gram.
How much does 1 cubic meter of fuel oil weigh
you would weigh 1 pound no matter how big you are
they weigh about 5 pounds