U.
2.81 MOI
a.
b
For the reaction 3Fe + 4H2O → Fe2O4 + 4H2, how many moles of iron oxide are produced from 500 g of
© 9 mol
I mol
3 mol
12 mol

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

It is e) i am not sure if you have any questions or need any