Concentrated sulfuric acid used in the laboratory is 92% H2SO4 by mass. Calculate the mass of water in a 100 g solution of this acid in kg.
92% H2SO4 by mass means 92g H2SO4/100 g solution.
If H2SO4 is 92 g H2SO4 in the 100 g of soln, then water must account for the other 8 grams. Now convert that to kg.
To calculate the mass of water in a 100 g solution of 92% sulfuric acid, we need to find the mass percentage of water in the solution.
Since the solution is 92% sulfuric acid, we can conclude that the remaining 8% must be water.
First, we need to calculate the mass of sulfuric acid in the solution:
Mass of sulfuric acid = 92% of 100 g = 92 g
To find the mass of water, we subtract the mass of sulfuric acid from the total mass of the solution:
Mass of water = Total mass of solution - Mass of sulfuric acid
Mass of water = 100 g - 92 g
Mass of water = 8 g
To convert this value to kilograms, divide it by 1000:
Mass of water = 8 g ÷ 1000 = 0.008 kg
Therefore, the mass of water in a 100 g solution of 92% sulfuric acid is 0.008 kg.