2. 20cm of butane is burned in 150 cm of oxygen. C. Huo(g) + O2(g) → 4CO2(g) + 5H2O(g)
What is the total volume of gas present after complete combustion of the
butane?
A 80cm
B 100cm
C 180cm
D 200cm

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.