A solution is made by dissolvinh 26.42g of (NH4) 2so4 in enough h2o to make 50.00ml of solution

what is the molarity of this solution?

We first need to convert grams of ammonium sulfate to moles.

molarity = moles of solute/liters of solution

To convert from grams to moles, we need to divide by it's molecular mass.

26.42 g (NH₄) ₂SO₄ * (1 mole (NH₄) ₂SO₄ / 132.14 g (NH₄) ₂SO₄) = 0.1999 mole (NH₄) ₂SO₄

0.1999 mol/0.05000L = 3.998 M

Since there 4 significant digits in both the volume and mass, we are limited to 4 significant digits.

Your final answer is 3.998 M (NH₄) ₂SO₄.