`Tabun (C5H11N2O2P) is one of the first nerve agents discovered, and this liquid

`Tabun (C5H11N2O2P) is one of the first nerve agents discovered, and this liquid is known for a fruity odor and can be sprayed as a mist that causes convulsions and paralysis. Tabun itself is not extremely deadly, but the success of this chemical compound in war led to the development of deadlier toxins like soman (C7H16FO2P) and sarin (C4H10FO2P). Iraqi soldiers used Tabun in the final days of the Iran/Iraq war to kill thousands of Iranians. Which of these compounds contains the highest percentage of phosphorus by mass?