At what temperature will water freeze if 100g NaCl are dissolved in 500g H2O?

water's Kf = 1.86 °C/m

Answer : The temperature at which water freeze will be,

Explanation :  Given,

Molal-freezing-point-depression constant for water =

Mass of NaCl (solute) = 100 g

Mass of water (solvent) = 500 g  = 0.500 kg

Molar mass of NaCl = 58.5 g/mole

Formula used :  

where,

= change in freezing point

= freezing point of solution = ?

= freezing point of water =

i = Van't Hoff factor = 2  (for NaCl electrolyte)

= freezing point constant for water =

m = molality

Now put all the given values in this formula, we get

Therefore, the temperature at which water freeze will be,

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.