MISSED THIS? Watch KCV: Limiting Reactant, Theoretical Yield, and Percent Vield, SWE: Limiting Reactant and Theoreticas Yield; Read Section Once the reaction has occurred as completely as possible, what mass of the excess reactant remains? 4.4. Yous can click on the Review link to access the section in Express the mass in grams to four significant figures. your eText. Elemental phosphorus reacts with chlorine gas according to the equation P4(s)+6Cl2(g)4PCl3(l) A reaction mixture initially contains 90.20gP4 and 262.9g Cl2