A hydrocarbon has an empirical formula CH and a vapour de...
A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.
[C = 12, H = 1]
C2H6
C3H8
C3H4
C6H6
Correct answer is D
molecular mass = 2 x vapour density
= 2 x 39 = 79
∴ Cn Hn = 78
12n + 1n = 78
13n = 78
n = 7813 = 6
∴ Cn Hn = C 6H 6
Which of the following pairs of elements has the greatest difference in electronegativity? ...
The method that cannot be used for removing permanent hardness of water is ...
The oxidation number of phosphorus in PO 3/4 is ...
3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO In the equation above, the values of p and x respectively are...
Water for town supply is chlorinate to make it free from ...
Which of the following metals has the strongest metallic bond? ...
Consider the following table Substitute Meltig point / ºC Boiling point / &...