A student dissolves 32 g of an unknown compound in 600 g of water. The boiling temperature of the solution is 101.5 ° C

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A student dissolves 32 g of an unknown compound in 600 g of
water. The boiling temperature of the solution is 101.5 ° C
a) Which of the following compounds is it:
1) Sodium carbonate (Na2CO3)
2) Glycerin (C3H8O3)
3) Lactose (C12H22O11)
4) Sodium chloride (NaCl)
justify your answer
b) What will be the osmotic pressure (in atm) of the solution at
a temperature of 25 ° C if under these conditions it has a density
of 1.09 g / mL?
Data: For water Kb = 0.52 ° C / m and Tb = 100 ° C