Boiling point of water at 750mm Hg is `99.63^@C` How much sucrose is to be added to 500g of water such that it boils at `100^@C K_b`(water)= 0.52K kg mol^(-1)`

Explanation

Elevation of boiling point,`Delta T_b =100-99.63 = 0.37^@`
`K_b` of water = 0.5 K kg `mol^(-1)`
Molar mass of sucrose `C_12H_22O_11= 342g mol^(-1)`
`Delta T_b = (1000K_bW_2)/(M_2W_1)`
`therefore W_2` (mass of solute)= `(Delta T_b M_2 W_1)/(1000K_b)= (0.37xx342xx500)/(1000K_b)`=121.67g