Question

The boiling point elevation constant for benzene, K_b, is 2.61 °C/m. The boiling point of pure benzene is 80.2 °C. A solution of 30.0 g of urea (CO(NH₂)₂, 60.06 g/mol) in 1.00 kg of methanol will raise the boiling point of benzene to

a. 85.4 °C
b. 80.4 °C
c. 81.5 °C
d. 82.8 °C
e. 78.9 °C

Answer 1

30.og useq - 30,0 mol = 0,5 mol 60.06 in 1.00 kg of me than us murs 0,5 1 и) од 6 411 molalith = 0,5 m AT = kb = 2.61 x 0.5 T-To 2 1.304 oC T-80.2°C = 1.304°C I=1.30 y at 80.2°C T 81.5 oc optim (81.5°C aus | Scanned with Cam Scanner

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