The freezing point of pure C_6H_6 is 5.50 degree C. A solution of 3.44 g of the

Question

The freezing point of pure C_6H_6 is 5.50 degree C. A solution of 3.44 g of the nonelectrolyte compound X in 122 g of C_6H_6 freezes at 4.10 degree C. Find the molecular weight of compound X. The freezing-point-depression constant of C_6H_6 is 5.12 degree C/(mol/kg) 93 amu.103 amu 119 amu 138 amu 221 amu The market demand curve in a perfectly competitive industry is downward sloping. horizontal. vertical. upward sloping Firms in perfectly competitive industries all are price takers. price searchers. price makers. price competitors. Using case 1, the quantity the firm will produce is ________ 500 550 shut down 450

Explanation / Answer

DTf = i*kf*m

(T0 - Ts) = i*kf*m

i = vanthoff factor = 1

kf of benzene = 5.12 c/molal

m = molality of mixer = (w/mwt)*(1000/W) = (3.44/x)*(1000/122)

T0 = freezing point of solvent(C6H6) = 5.5 c

Ts = freezing point of solution = 4.1

(5.5-4.1) = 1*5.12*(3.44/x)*(1000/122)

x = molecular weight of X = 103.12 g/mol

answer: b

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