A fuel oil consists of 4 fractions A, B, C and D. Their molar compositions and vapour pressures are given below :

The vapour pressure of the fuel oil will be __________ mm Hg.

ANS:A - 736

To determine the vapor pressure of the fuel oil mixture, we need to consider the given fractions and their compositions. Typically, the vapor pressure of a mixture can be estimated using Raoult's law, which states: Ptotal=∑ixiPiP_{\text{total}} = \sum_{i} x_i P_iPtotal​=∑i​xi​Pi​ where:

• PtotalP_{\text{total}}Ptotal​ is the total vapor pressure of the mixture,
• xix_ixi​ is the mole fraction of component iii,
• PiP_iPi​ is the vapor pressure of component iii.

Given:

• Fraction A: Molar composition = xAx_AxA​, Vapor pressure = PAP_APA​
• Fraction B: Molar composition = xBx_BxB​, Vapor pressure = PBP_BPB​
• Fraction C: Molar composition = xCx_CxC​, Vapor pressure = PCP_CPC​
• Fraction D: Molar composition = xDx_DxD​, Vapor pressure = PDP_DPD​

Without the exact compositions and vapor pressures provided, it's challenging to calculate the precise vapor pressure using the formula above. Therefore, the correct vapor pressure among the given options cannot be determined with the information provided.