Look on the periodic table and add everything.
2*H + 1*S + 4*O = ?
how would you do 3PO-4
Is that 3PO^-4 or 3(PO4)^3-
I can't tell what you mean.
1*P + 3*O
A number as a subscript means you multiply what it is a subscript to by that number.
P2 is 2*P
1P + 4*O
3*H + 1*P + 4*O
If there are parentheses, the subsceript multiplies everything in the parentheses by that number.
3*Ba + 2*P + 8*O
A number as a coefficient multiplies the entire molecule by that number
2NaCl is 2Na + 2Cl
4*Na + 2*S + 8*O
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