Question

What is the rule for writing a chemical formula

Answer 1

Both sides of the equation should be balanced..
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Answer 2

1. Count capital letters (like you did in kindergarten) for elements
Each capital letter represents 1 atom of 1 element
2. Coefficient (Big number) tells how many molecules.
Use distributive property for coefficients to apply to each element
3. Subscript follows after its affected element and tells they are connected.
4. Apply order of operations (PEMDAS) and the distributive property.