Given the equations and the values of AH' for the combustion of CH (9) and the combustion of C(graphite) represented above, which of the following additional information is needed to determine the values of AH' for the overall reaction 2 C(graphite) + 3 H2(g) → C2H6(g)?

i think 4.44 moles

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.