# What is the expected boiling-point elevation of water for a solution that contains 150 g of sodium chloride dissolved in 1.0 kg of water?

We're asked to find the expected boiling point elevation of a solution given the amount of solute dissolved in water.

To do this, we'll use the equation

where

#DeltaT_b is the boiling point elevation; how much the boiling point increases

Molality is given by

The molality is thus

Plugging in known values, we have

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To calculate the expected boiling-point elevation, you can use the formula: ΔTb = i * Kf * m, where ΔTb is the boiling-point elevation, i is the van't Hoff factor (for NaCl, i = 2), Kf is the molal boiling-point elevation constant for water (approximately 0.512 °C kg/mol), and m is the molality of the solution (mol solute/kg solvent). Plug in the values to find the result.

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