What is the empathy in kJ for the reaction: C3H8(g) + 5 O2(g) --> 3CO2(g) + 4H2O(g) C3H8 ∆H= -108.4kJ
O2 ∆H= 0
CO2. ∆H= -393.5
H2O ∆H= -241.8

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.