Asample of c3h8o that contains 200 molecules contains carbon atoms.

The answer is 600. A sample of C3H8O which contains two hundred molecules, it also holds six hundred carbon atoms. A carbon atom holds six electrons, four of its electrons are found in its valence shell or also known as its outer shell.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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.