JAMB - Chemistry (2024 - No. 41)
The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\) and a molar mass of 30 is
C\(_2\)H\(_4\)
C\(_3\)H\(_3\)
C\(_2\)H\(_6\)
C\(_6\)H\(_6\)
Paaiškinimas
Empirical formula x n = Molecular mass
(CH\(_3\) ) X n = 30 ; Given that C = 12, H = 1
[ 12 + (1x3) ] n = 30
15n = 30
n = \(\frac{30}{15}\)
n = 2.
Molecular formula = (CH\(_3\) ) X n = (CH\(_3\) ) X 2 = C\(_2\)H\(_6\)