Need the answer !
which chemical reaction model is flawed?

a.

4 c2 + s8 → 4 cs2

b.

2 fe + 3 cl2 → 2 fecl3

c.

2 na + cl2 → 2 nacl

d.

p4o10 + 6 h2o → 4 h3po4

part 2

which best explains the correct answer to part 1?

a.

the products side of the equation should include water.

b.

the model shows an unbalanced number of carbon atoms.

c.

the coefficients on the reactants and products sides of the equation do not match.

d.

the same elements are on both the reactants and products sides of the equation.

Answer No 1:

The chemical model that is flawed is:

4 C2 + S8 → 4 CS2

In this reaction, there are more number of carbon atoms in the reactants but lesser number of cabon atoms in the products. For a reaction to be balanced, there should be the same number  of atoms in the reactants and products. Hence, option A does not represent a balanced equation.

Answer No 2:

The correct option is B) The model shows an unbalanced number of carbon atoms.

Consider the equation:

4 C2 + S8 → 4 CS2

In the reactants side of the equation, there are 8 atoms of carbon. In the products side there are only four carbon atoms. This shows that this equation in not balanced because of the carbon atoms.

The number of sulfur atoms remains same before the reaction and after the reaction. There are eight sulfur atoms in the reactants as well as products.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.