How many carbon and hydrogen atoms are there in Propane, respectively?
3, 8
Why propane is C3H8
Propane is an alkane, a type of hydrocarbon with the general formula CnH2n+2. The name propane indicates the prefix prop- which means 3 carbon atoms.
Alkane formula: CnH2n+2 → for n=3 → C3H8
Step-by-step
- Recognize that propane is an alkane, so use
H = 2n + 2. - For n = 3 (three carbons):
H = 2×3 + 2 = 8. - Therefore the molecular formula is C3H8 — 3 carbons and 8 hydrogens.
Compare with: Methane CH4 (n=1) and Ethane C2H6 (n=2) to see the same pattern: each time you add a carbon, hydrogen increases by 2.
Important Questions from Hydrocarbons
The number of structural isomers of pentane is
- Refining of petroleum is carried out using which one of the following techniques?
Directions: The following 05 (Five) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the answers to these items using the code given below:
Statement I: Petroleum is a mixture of many different hydrocarbons of different densities.
Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons.
In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n + 2 (n = 0, 1, 2, 3 etc.)?
The chemical formula of propene is:
