Molarity=Volume of solution in litreNo of moles of solute
Step 1: To find the mass of water in one liter.
We know that,
Density of water = 1g/ml
or = 1kg/L
Therefore, the mass of 1L of water will be:
Mass= Density of water × VolumeMass=1Lkg×1LMass=1kg=1000g
Step 2: To find the molar mass of water
Molar mass of H2O = 2×H+1×O
Molar mass of H2O = 2×1+1×16
Molar mass of H2O = 2+16 = 18 g/mol
Step 3: To find the molarity in 1kg of water.
Moles in 1kg of water =molarmassmass =18 g/mol1000 g=55.55 mol
Molarity of water = =1L55.55moles=55.55 M
Final answer: Option C
Molarity of water is 55.5M