Question

A concentrated sulfuric acid solution is 65.0% H2SO4by mass and has a density of 1.55 g/mL at 20°C. What is the mass in kg of 3.00 L of the concentrated sulfuric acid solution

Answer 1

The density is 1.55g/mL of solution, then there will be 1550 g of solution per liter; we can arrive at this answer because there are 1000 mL in a liter:
1.55g/mL * 1000mL/L = 1550 g/L

Now, 65% H₂SO₄ (sulfuric acid, btw) by mass:
1550 * .65 = 1007.5 g/L.
However, There are 1000g in each kg, so we divide our answer by 1000 to get the answer into kg. Our new answer is 1.0075 kg per litre. So for 3 litres 3 * 1.0075 kg = 3.022 kg.