A sample of chlorine contains two different isotopes, one with a mass of 35 and one with a mass of 37. The relative (average) atomic mass of the chlorine atoms in the sample is 35.5. What does this tell you about the amounts of each isotope in the sample?

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.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.