Copper has two isotopes; 63Cu and 65Cu with the amount of 79.4% and 20.6%, respectively. Calculate the mass of 0.1 mol 63Cu if the average atomic mass of copper is 63.5 and atomic mass of 65Cu is 65.1 A. 3.5 g
B. 6.31 g
C. 15.3 g
D. 16.8 g
E. 20.2 g

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.