Ascientist is comparing the outer structure of an onion cell, structure X, to the outer structure of a human skin cell, structure Y.
Which generalization is true about the types of structures being examined?
Structure X is not living, and structure Y is living,
Structure X can be found in some human cells, and structure Y can be found in some plant cells.
Structure X is only found in plant cells, and structure Y is found in plant and animal cells.
Structure X is semipermeable, and structure Y is selectively permeable.

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

c, liquids evaporate, creating a gas