Question

how many moles of Na are present in 120 g sodium sulphate​

Answer 1

Answer:

3 mole

Explanation:

Molar mass of sodium hydroxide =40

No. of moles =Mass/Molar mass

No. of moles (n) = 120/40

=3 moles

There are N formula units per gram formula weight. 120 grams of NaOH means 3 Moles of NaOH because 40 grams (Molecular Weight in grams) is one mole of NaOH. Each mole of any substance contain Avogadro's number of molecules ie., 6.022 x (10 to the power 23