Question

• What mass of carbon tetrachloride (CCl4 ) is needed to dissolve 356 g iodine (I2 (s)) so that the vapor pressure of CCl4 decreases by 25.0 % its initial amount?

Answer 1

The answer & explanation for this question is given in the attachment below.

Answer 2

The vapor pressure of CCl4 decreases by 25.0 % its initial amount is 1.4g.

Carbon tetrachloride (CCl4)

Molar mass of (I2)=253.8089g/mole

• Moles of I2= mass/molar mass
• Moles of I2=356/253.8089
• Moles of I2=1.40moles

Suppose :

X= number of moles CCI4

mole fraction (CCI4)

X/X+1.4=0.75

• X=0.75 (X+1.4)
• X-0.75=0.75+1.4
• X=1.04

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