If it is in the gas phase, it depends on the temperature and pressure. See the Related Questions regarding Ideal Gas Law questions for how to solve this type of problem.
one gallon may hold between 2 - 7 kilograms
5 gallons of rocks, weigh is 41.75
errr 5 gallons in 1 million gallons = 5 parts per million
5 U.S. gallons of water weigh approximately 41.73 lbs. 5 Imperial gallons of water weigh exactly 50 lbs.
Five gallons of milk weigh approximately 43 pounds, although it depends on the milk's fat content, etc, so the answer can't be exact.
1.2 gallons
5 gallons of rocks, weigh is 41.75
errr 5 gallons in 1 million gallons = 5 parts per million
5 U.S. gallons of water weigh approximately 41.73 lbs. 5 Imperial gallons of water weigh exactly 50 lbs.
5 gallons of cement would weight 5 * the weight of 1 gallon
Five gallons of sand would actually weigh more than five gallons of water.
30
41.75 pounds
About 42 pounds.
40 pounds
That depends on the type material you are referring to. Also, these are two different types of measurements. Gallons is a measure of volume but the other is weight or mass. Please edit your question to include more context or details.
There are several different types of Lacquer available. As they work and weigh very differently this question in not answerable
The specific gravity of limestone concrete is 2.37. Therefore 5 gallons of concrete would weigh 94.8 pounds.