Explain how you would change a measurement in centimeters to kilometers?

Converting a measurement in centimeters to kilometers one needs to know the actual number of 1 kilometer that makes centimeters.

Explanation:

Converting a measurement in centimeters to kilometers one needs to know the actual number of 1 kilometer that makes centimeters.

The number of 1 km that makes centimeters is 100000 cm. This expression can be represented mathematically as follows

1 km = 100000 cm

For example If one wants to convert 100 cm  to km we use the unit conversion above to get the actual conversion to km .

since

1 km = 100000 cm

? km = 100 cm

cross multiply

100/100000

0.001  km

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

one state would change   like louisiana to texas. thats a change

explanation: