What are the atomic number and mass number of this atom

Which of the following are correct values for the ideal gas laws constant r

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.

How many moles of bromine are needed to produce 3.23 moles of potassium bromide