This formula equation is unbalanced. p4(s) + cl2(g) mc030-1.jpg pcl3(l) which coefficient should be placed in front of pcl3 to balance this equation?

To balance a chemical reaction, we need to remember that the number of each atom in the reactant and the product side of the equation should be equal. So, from the reaction P4(s) + Cl2(g) = PCl3(l), there are 4 P atoms in the reactant, the P atoms in the prodcut side should be 4 as well. We balance as follows:

 P4(s) + 6Cl2(g) = 4PCl3(l)

Therefore, the coefficient of the PCl3 should be 4.

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Yes, endothermic means it turns cold. and some chemical changes include change of tempature.