JEE Mains 2020 Model Paper 1 New Pattern

Question : 74 of 75

Marks: +1, -0

A solution of 0.640 g of azulene in 100.0 g of benzene boils at 80.23 °C . The boiling point of benzene is 80.10 °C; the b K is 2.53 °K /molal. What is the molecular weight of azulene?