Example: Sugar (C12H22O11) - Add up the masses of each element. (Look at your periodic table for the masses.) Please and thank you so much :)

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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.

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.