Acompound is isolated from the rind of lemons that is found to be 88.14% carbon and 11.86% hydrogen by mass. 120.0 grams of said compound. what is the empirical formula?

CH2

Explanation:

Divide their percentages respectively by their atomic masses, take the least significant value to divide others. Eg

C has 88.14% an atomic mass of 12g/mol,

Hydrogen has 11.86% with atomic mass of 1g/mol.

C =88.14/12=7.345

H=11.86/1=11.86

Dividing through by the least number

C=7.345/7.345=1

H=11.86/7.345=2

Empirical formula therefore is CH2

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

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume