The enthalpy of combustion for octane (C3H13()), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C3H18(1) + 12.502(g) → 8C02(g) + 9H2O(g).
What is the AHq for this reaction?

16CO2(g) + 18H2O(g) → 2C3H18(1) + 2502(g)
kJ

Mg-26 and mg-24 are pair of isotopes. isotopes are defined as atoms of the same element having same atomic number but different mass number. i hope that was .

It decreases by 4 is your answer mark brainliest 

It is a ok  i know i have a brain functioning well.