What would you need to do to calculate the molality of 10 g of NaCl in 2 kg of water?

A. Convert the 2 kg of water to liters of water.

O B. Convert the 10 g of NaCl to moles of NaCl.

C. Convert the 2 kg of water to moles of water.

O D. Convert the 10 g of NaCl to kg of NaCl.

O B. Convert the 10 g of NaCl to moles of NaCl.

Explanation:

The formula for finding the molality is m=moles of solute/kg of solvent. The solute for this question is NaCl and the solvent is water.

(10g NaCl)(1 mol NaCl/58.44g NaCl)=0.1711 mol NaCl

58.44 is the molar mass of NaCl

m=0.1711 mol NaCl/2 kg H2O

m=0.085557837

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