. Experimentalmente se comprueba que 5,58 g de hierro se combinan con 3,21 g de azufre obteniéndose un compuesto llamado sulfuro de hierro (II).
a) Calcula la masa de hierro necesaria para que reaccione con 1,23 g de azufre y se
obtenga este sulfuro de hierro (II).
b) ¿En qué ley fundamental se basa la respuesta a la pregunta formulada? Enúnciala.

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.