A program to determine the molecular weight of a hydrocarbon based on the number of Hydrogen,Carbon and Oxygen atoms.

import os
import math

# A program to calculate Molecular Weight of a Hydrocarbon

# These are the atomic weights(grams/mole) of Hydrogen,Carbon and Oxygen
atomicwtH = 1.0079
atomicwtC = 12.011
atomicwtO = 15.994

Hatoms = input("Enter the number of Hydrogen atoms ")
Catoms = input("Enter the number of Carbon atoms ")
Oatoms = input("Enter the number of Oxygen atoms ")
#Before calculating, we change the type of the input to int to avoid incompatibility issues.

atomicwtHmol = int(Hatoms)* atomicwtH
atomicwtCmol = int(Catoms)* atomicwtC
atomicwtOmol = int(Oatoms)* atomicwtO

totalmolwt = atomicwtHmol+atomicwtCmol+atomicwtOmol

print("Molecular Weight = "+str(totalmolwt)+" gms/Mole")

                                                       OUTPUT.

Enter the number of Hydrogen atoms 15
Enter the number of Carbon atoms 5
Enter the number of Oxygen atoms 8
Molecular Weight = 203.1255 gms/Mole