Q.

What will be the molarity of pure water?

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a

18 M

b

50.0 M

c

55.6 M

d

100 M

answer is C.

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Detailed Solution

Molarity is defined as the number of moles of solute per liter of solution. For pure water, since it is not a solution with a separate solute, we consider water itself to be the solvent. To calculate the molarity of pure water, we need to treat the mass of water as the solute.

  • The molar mass of water (H₂O) is 18 g/mol.
  • 1 liter of water weighs approximately 1000 grams.

To find the molarity, divide the number of moles of water by the volume in liters:1000( volume in mL)18( molar mass )=55.6

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