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Notice that "SO4" appears in two different places in this chemical equation. SO42− is a polyatomic ion called "sulfate." What number should be placed in front of CaSO4 to give the same total number of sulfate ions on each side of the equation?

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sebassandin

Answer:

3.

Explanation:

Hello,

In this case, it is convenient to write the chemical reaction as:

[tex]CaSO_4+AlCl_3\rightarrow CaCl_2+Al_2(SO_4)_3[/tex]

Which balanced turns out:

[tex]3CaSO_4+2AlCl_3\rightarrow 3CaCl_2+Al_2(SO_4)_3[/tex]

Thus the number that should be in front of the calcium sulfate is 3 in order to balance the reaction.

Best regards.

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