Answer:
Option-A, 142 g is the correct answer.
Solution:
Balance Chemical Equation is as follow,
2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O
According to equation,
79.98 g (2 mole) NaOH react to form = 142 g (1 mole) of Na₂SO₄
So,
80 g NaOH on reaction will produce = X g of Na₂SO₄
Solving for X,
X = (142 g × 80 g) ÷ 79.99 g
X = 142.01 g of Na₂SO₄
