What happens when a pure substance undergoes a chemical change?

How many liters of water vapor can be produced if 108 grams of methane gas (ch4) are combusted at 312 k and 0.98 atm? show all work. pls ! will mark as brainliest

In which situation can a mixture always be called a solution

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?