For the process described, compare ΔH with ΔE of the system.
A solid yields a mixture of gases in an exothermic reaction that takes place in a container of variable volume.
A. ΔH is less than (more negative) Δ E of the system.
B. ΔH is greater than ΔE of the system.
C. ΔH is equal to ΔE of the system.
D. can't be determined without more information

Option A.

∆H is less than (more negative)∆ E of the system

Explanation:

From the question, a solid yield a mixture of gases in an exothermic reaction. Exothermic reaction is a process that give out energy after the reaction, it is mostly represented by negative H, that is enthalpy .

The enthalpy is negative( ∆H) when the reaction release energy meaning that the energy that must be absorbed to break the bonds of the reactants is greater than than energy released when new bonds are formed.

From the reaction more heat is released.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-