20 grams. Its mass does not change when it changes from a liquid to a gas - only its volume (which is much larger - how much larger depending on the pressure of the gas).
About 6.25 pounds per gallon at 72 degrees Fahrenheit.
yes
17 US gallons of gasoline weighs about 107.1 pounds.
because the hot water in the can mix causing steam filling the can with gas. that puts too much pressure on the can and it implodes to get rid of the gas inside
There is a sensor inside, much like the one in your car's gas tank.
Gasoline is less dense than water, which has a density of 1 kg / liter. Depending on alot of variables, gasoline has a density of 0.71 to 0.77 kg / liter. So to answer your question, 1 liter of gasoline weighs 710 to 770 grams.
no
In order to figure this out, you must do dimensional analysis. Here it is: 3.0 moles He x 4.0026 grams/ mole He = 12 grams
The mass is 3,358 kg.
34 grams
36 grams
1 gallon of propane gas weighs 4.2 pounds.
8.62
220 if your on the gas
This looks like a typo...If you mean "how much does gas weigh", automobile gasoline weighs approximately 6 lbs. per US gallon. I leave it to you to do the necessary conversions to Imperial gallons, litres, kilograms, etc.
Matter might look different after a physical change, but the kind of matter itself does not change. Its particles have not changed. They are just packed together differently.
That's depends on what fluid you want to weigh, "Water" at 8.34lbs per gallon would weigh 391.98lbs. for 47 gallons, different liquids have different weights. Example: Gas, (for car) weighs less then water, gas will float on water. depending on what type of Gas, Gas weighs from, 5.8 to 6.15lbs. per gallon.