Answer:
It is the sum of internal energies of two or more substances
Explanation:
The number of atoms in a molecule can be calculated by adding all of the number of elements from the chemical formula. For chlorophyll, the chemical formula would be <span>C55H72MgN4O5 adding all the elements we have 137 atoms. Hope this answers the question.</span>
Explanation:
The chemical formula of an ionic compound can be written by using the symbols of the respective cations and anions.
The overall charge on the molecule should be zero.
Hence, the total charge of cations=total charge of anions.
The symbols of the given molecules are shown below:
sodium chloride ---- NaCl
magnesium chloride ---![MgCl_2](https://tex.z-dn.net/?f=MgCl_2)
calcium oxide ---- CaO
lithium phosphide----![Li_3P](https://tex.z-dn.net/?f=Li_3P)
aluminum sulfide ----- ![Al_2S_3](https://tex.z-dn.net/?f=Al_2S_3)
calcium nitride---- ![Ca_3N_2](https://tex.z-dn.net/?f=Ca_3N_2)
This is a combination reaction. Look at the 2 elements on left and a compound on the right.
The reaction, Fe2O3 + 3CO------> 2Fe + 3CO2 is an oxidation-reduction reaction.
An oxidation-reduction reaction is a reaction in which there is a change in oxidation number from left to right in the reaction. This is because, a specie is oxidized and another specie is reduced.
In the reaction; Fe2O3 + 3CO------> 2Fe + 3CO2, we can see that the oxidation number of iron decreased from +3 on the left hand side to zero on the right hand side. The oxidation number of carbon was increased from + 2 to +4.
Learn more: brainly.com/question/10079361