PO4 is phosphate and it has a negative charge of 3
It is what we call a polyatomic ion. You kind of have to know these by memory or through some sheet, but since the charges have to be neutral Iron would have to be a positive 3
<h3><u>Super fuel or high performance fuel is petrol with a higher octane rating. Most standard brands of fuel have a 95 octane rating. But super fuel typically has a higher rating - around 98 - which can make the engine work more efficiently and improve performance.</u></h3>