Determine how many atmospheres or pressure are equal to 65.78

The answer is 0.6492 atm. The given quantity 65.78 kPa is multiplied by a conversion factor in which the numerator and denominator are equal, hence, it is like multiplying by 1 which does not change the given value. To convert kPa to atm, we use the conversion factor 1 atm = 101.325 kPa. Therefore,      
     65.78 kPa (1 atm/101.325 kPa) = 0.6492 atm

And a) oxygen i believe