If the chemical formula is k2so4 what is the number of elements

The chemical compound with the chemical formula K2SO4 consists of potassium  (K), sulfur (S) and oxygen (O) elements. 2 atoms of potassium, 1 atom of sulfur and 4 atoms of oxygen combine to form one molecule of K2SO4. For this reason, the compound consists of 3 elements. They are: potassium with symbol K, sulfur with symbol S and oxygen with symbol O.

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

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