how many moles of fe2o3 will be produced from 18.0 g of fe, assuming o2 is available in excess?

How many neutrons does a atom of cobalt have?

Ineed to find the answer of this question because i dont understand it

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line