Which solution has a molality of 0.25m nacl?
Molality can be expressed by moles of solute overkilograms of solvent. The question asks the molality of 0.25m NaCl. 0.25m NaClis equal to 0.25 moles of NaCl over 1 kg of water.
0.25 moles of NaCl over 1 kg of water