Which is the formula mass of na2so4

142.04 g/mol

That is it

Explanation:

Formula mass of a compound is calculated by taking the sum of atomic masses of all the elements present in the compound.

Since, atomic mass of Na = 23 g/mol

Atomic mass of S = 32 g/mol

Atomic mass of O = 16 g/mol

Hence, formula mass of will be as follows.

                  Formula mass =

                                           = 142 g/mol

Thus, we can conclude that formula mass of is 142 g/mol.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.