Is the combustion of propane endothermic or exothermic?

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

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

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.