Asked by jaz
Determining a Molecular Formula from an Empirical Formula
1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?
1. A compund has an experimental molar mass of 78g/mol. Its empirical formula is CH. What is its molecular formula?
Answers
Answered by
DrBob222
The idea here is to see how many CH groups you have or put another way (CH)<sub>x</sub> where you want to determine x.
So if x is 1, what would the molar mass be? It would be 12 for C + 1 for H = 13 for the CH. If x = 2, then the molar mass would be 26. If x = 3, the molar mass would be 3 x 13 = 39. So what time 13 = 78 (or close to it).
So if x is 1, what would the molar mass be? It would be 12 for C + 1 for H = 13 for the CH. If x = 2, then the molar mass would be 26. If x = 3, the molar mass would be 3 x 13 = 39. So what time 13 = 78 (or close to it).
Answered by
jaz
13 times 6 =78
Answered by
Joseph
CH=78g/mol
but the relative atomic mass of C=12 and H=1
therefore the molecular mass would be
(12+1)n=78 g/mol
13n = 78 g/mol
n=6
the molecular formula is C6H6 .
but the relative atomic mass of C=12 and H=1
therefore the molecular mass would be
(12+1)n=78 g/mol
13n = 78 g/mol
n=6
the molecular formula is C6H6 .
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