Quickly but you are asked to make 112 g of iron from iron oxide and excess carbon monoxide. fe2o3 (s) + 3co (g) → 2fe (l) + 3co2 (g) approximately how many grams of iron oxide must you use? question 5 options: a. 720 g b. 240 g c. 107 g d. 160 g

Calculate  the number of   moles  of  moles  of  iron  prepared
mole=  mass/RFM
RFM   of  iron  is =56  g/  mol
moles  of  iron prepared  is  therefore   112g /56g/mol=2moles
by  use  of  reacting  ratio between Fe2O3 to  Fe  that  is  1:2  therefore  moles of  Fe2O3  used  is  (1x2)/2+1 mole
mass  of  Fe2O3=RFM  x number  of  moles
RFM of Fe2O3=160g/mol
mass= 1 mole  x 160 g/.mol=160g (D)

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

The air is going to come out because of the low pressure.