What is a difference between oil and flour? O Oil is a soluble substance, and flour is an insoluble substance.
O Flour is a soluble substance, and oil is an insoluble substance.
O Oil forms a layer at the top of water, and flour settles at the bottom.
O Oil forms a layer at the bottom of water, and flour settles at the top.

Hel plz

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

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements