What is an ecosystem. A. It is a single plant and a single animal that live in given area B. it is a community of plants, animals and their physical surrounding. C it is the members of the same species in an area. D it is one species that lives in a given area GIVE BRANLIYST​

B. it is a community of plants,animals and there physical surrounding.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).