Question

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?

Answer 1

Answer:The coefficient should be placed

• in front of$PCl_3$ to balance this equation is 4.
• In front of $Cl_2$ to balance this equation is 6.

Explanation:

$P_4(s)+Cl_2(g)\rightarrow PCl_3(l)$

The above chemical equation can be balanced as:

$P_4+6Cl_2\rightarrow 4PCl_3$

The coefficient should be placed

• in front of$PCl_3$ to balance this equation is 4.
• In front of $Cl_2$ to balance this equation is 6.

Answer 2

Coefficient of 4 is placed in front of $PCl_3$ to balance this equation.

Explanation:

According to law of conservation of mass, the mass can neither be created nor be destroyed. Thus the mass of products must be equal to the mass of reactants.

In order to have same mass on both sides of the chemical equation, the number of atoms of each element must be same in reactants as well as products. Thus all the chemical  equations are balanced.

The balanced chemical equation is:

$P_4(s)+6Cl_2(g)\rightarrow 4PCl_3(l)$

Thus coefficient of 4 is placed in front of $PCl_3$ to balance this equation.

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