How many molecules are in 83.2 g of chlorine gas (Cl2)? Group of answer choices
14.2 x 10^24 molecules
1.78 x 10^28 molecules
1.42 x 10^24 molecules
7.04 x 10^23 molecules

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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