ALEKS - Writing a Chemical Equation from a Description of the Reaction

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For the Zinc problem how come you didn’t put the +2 charge in the beginning of the equation when you were setting it up?

khaleahmckenzie
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So how do you know the numbers to put as the subscript when making the formula? I can never really tell, and when I ask for an explanation it just tells me that it’s 2 or 3 but it doesn’t explain where they get that number from

anyichibuogwu