To find the molarity (M), use the formula:
M=Vnsolute×1000
Given that the solution is 31.4% H2SO4, with a density of 1.25 g/mL:
Step 1: Calculate the mass of H2SO4 in 100 g of solution:
Mass of H2SO4=31.4g
Step 2: Convert this to moles:
9831.4=0.32mol
Step 3: Find the volume of the solution:
Volume=DensityMass of solution=1.25100=80mL
Step 4: Calculate molarity:
M=80mL0.32mol×1000=4.005≈4M
So, the correct answer is: 4M