Calculate an integer obtained by adding solution codes of all true statements and duducting solution codes of all incorrect statements.
`{:("Statements",,"Solution codes"),("1. " PV_(m) "for all gases whether real or ideal approach to same value as P approaches zero.",,12),("2. Vander-wall constant a for " H_(2) "is more as compared to a for " O_(2),,8),("3. Vander-wall theory assumes interparticle interactions to be either attactive or repulsive",,2),("4. At normal temperature compressibility of He gas can be less than that of ideal gas. ",,5),("5. Negative deviations in Z vs P curve is attributed to finite size of molecules.",,4),("6. Free volumes available for molecules of an ideal gas is same as volume of container.",,3),("7. Isotherms of an ideal gas and real gas will be non intersecting hyperbolas.",,2):}`

Answer

4

Explanation

12-8-2+5-4+3-2=4