Q. A 0.5 molal solution of NaCl means:

NaCl के 0.5 मोलल घोल का अर्थ है:

0.5 mol of NaCl in 1000 mL of solution
1000 एमएल घोल में 0.5 मोल NaCl

0.5 mol of NaCl in 1000 g of solvent
1000 ग्राम विलायक में 0.5 मोल NaCl

0.5 mol of NaCl in 1000 g of solution
1000 ग्राम घोल में 0.5 मोल NaCl

0.5 g of NaCl in 1000 g of solvent
1000 ग्राम विलायक में 0.5 ग्राम NaCl

Molality (m) is defined as moles of solute per kilogram of solvent.

Key distinction:

Molarity (M): moles of solute per liter of solution

Molality (m): moles of solute per kilogram of solvent

Therefore, 0.5 molal means 0.5 mol of NaCl dissolved in 1000 g (1 kg) of water (solvent), not solution.

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