How many moles of Na2SO4 are present in 284.078 grams of Na2SO4?2356

2moles

Explanation:

Given parameters:

Number of moles of Na₂SO₄   = 284.078g

Unknown:

Number of moles in the compound  = ?

Solution:

To solve this problem;

        Number of moles  =  

  Molar mass of Na₂SO₄  = 2(23) + 32 + 4(16)  = 142g/mol

 Number of moles  =   = 2moles

answer; /// i do believe that the correct answer is (c)nuclear bond

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.