How much energy is required to form 141.8g of Cl2, according to the reaction below? 4PCl3 –> P4 + 6Cl2 changeH°rxn= +1207KJ
Molar mass of PCl3 is 137.32g/mol and may be useful.

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explanation:

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

it's c (engineer's do their work with mechanical stuff not on any living being)

i believe the answer is three water molecules