Astudent needs 15.0 g of ethyl alcohol for an experiment. if the density of the alcohol is

0.789 g/ml, how many milliliters of alcohol are needed?

19.011 mL

Explanation:

Upon bringing out the parameters mentioned in the question we have;

Mass = 15.0g

Density = 0.789 g/mL

Volume (mL) = ?

The relationship between all three parameters is given as;

Density = Mass / Volume

0.789 = 15 / V

V = 15 / 0.789 = 19.011 mL

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