PLEASE HELP!! 25 grams of methane is placed inside a constant volume calorimeter. After the fuel is burned, the temperature rises by 4.5 deg C. If the heat capacity of the calorimeter is 5.75 kj/deg C what is the heat released?

What is the molar mass of a gas that has density of 2.054 g/l

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !