To two decimal places, write the molar masses of carbon, neon, iron, and uranium

Answer : The molar mass of carbon = 12.01 g/mol

The molar mass of neon = 20.18 g/mol

The molar mass of iron = 55.85 g/mol

The molar mass of uranium = 238.03 g/mol

Explanation :

Molar mass : It is defined as the mass in grams of one mole of substance and each element has its own unique molar mass. It is expressed in grams/mole or g/mol. It is equal to the mass of atom present in 1 mole.

Thus,

The molar mass of carbon = 12.01 g/mol

The molar mass of neon = 20.18 g/mol

The molar mass of iron = 55.85 g/mol

The molar mass of uranium = 238.03 g/mol

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