Respuesta :
C12H208 is the molecular formula of the alcohol.
Explanation:
The weight of carbon given is 26.05 grams
The weight of H20 = 6.630 grams
first let us find the number of moles of:
number of moles = weight given ÷ mass of 1 mole of the element
= 26.05 ÷ 12
= 2.170 moles of carbon
number of moles of hydrogen present in H2O
= 6.630 ÷ 18
= 0.368
1 mole of water contains 2 mole of hydrogen so, 2 × 0.368 grams
= 0.7366 moles
Number of moles of oxygen cannot be calculated as of now.
So from the data obtained,
50 gms C2H2Ox is combusted.
Lets, calculate the gms from moles using the same equation
For carbon, 2.170 × 12
= 26.04 grams
For hydrogen, 0.368 × 1.01
= 0.3716 grams
adding the carbon and hydrogen content, 26.04 grams
now the oxygen content can be obtained by
50 - 26.04
= 23.96 grams
Now moles of oxygen calculated as
n = 23.96 ÷ 16
= 1.49 moles of oxygen
The emperical formula for the alcohol is C6H04
now the molar mass is divided by emperial formula mass.
molar mass = 189 amu
emperial formula mass = 137
the division would give= 1.37
it can be taken as 2
The subscript in the formula is multiplied by 2 to get molecular formula from emperial formula.
So, C12H208 is the molecular formula of the alcohol.
