Which of these statements is correct about water and oil? O Water is not a mineral because it is a liquid but oil is a mineral because it is formed under the ground by natural processes.
O Both water and oil are minerals because they are natural materials with a definite chemical composition.
Water is a mineral because it has a definite chemical composition but oil is not a mineral because it is organic.
O Both water and oil are not minerals because they are liquids.

c is the answer because when something is left after something evaporates that shows the chemical change.

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