Which profile best describes the reaction C(s) + 2H2(g) → CH4(g), AH = -74.9 kJ?

Chemistry

2 answers:

katrin [286]3 years ago

8 0

Answer:

Option B. A

Explanation:

From the question given above, the following data were obtained:

C(s) + 2H₂ (g) —> CH₄ (g). ΔH = –74.9 kJ

From the reaction above, we can see that the enthalpy change (ΔH) is negative (i.e –74.9 KJ) which implies that the heat content of the reactants is greater than the heat content of the products. Thus, the reaction is exothermic reaction.

For an exothermic reaction, the energy profile diagram is drawn in such a way that the heat content of reactants is higher than the heat content of products because the enthalpy change

(ΔH) is always negative.

Thus, diagram A (i.e option B) gives the correct answer to the question.

enyata [817]3 years ago

3 0

Answer:

B. A

Explanation:

Graph A, I just took a quiz on a p e x and it was correct!:)

You might be interested in

The expression CaCO3 → CaO + CO2 is an example of a

sattari [20]

It is a decomposition 'reaction

8 0

3 years ago

Read 2 more answers

I know this isn't the subject of math, but nobody can answer it in math and I need help with the steps because I need to turn it

djyliett [7]

F(x)=-1/x
g(x)=√(3x-9)

Domain of (f/g)(x): ??

1We find out the domain of f(x):
f(x) is a rational function, therefore can take real values if the denominator is not ("0"), therefore the domain of f, will be all values excpet "0"
Domain of f: (-∞,0)U(0,+∞);

      o
----------------------------------------------O-------------------------------------------
←-------- -∞    +∞ ----------→

g(x) is a radical square root function, therefore the radicand have to be greater than o equal to "0"
3x-9≥0
3x≥9
x≥3

   3
.........................................................Ф--------------------------------
←--------- - ∞    +∞ -----------→

(f/g)(x) = (-1/x) / (√(3x-9)) is a rational function with a square root in the denominator,also the square root don´t take the value of "0";
Therefore:
3x-9>0
3x>9
x>3

The domain of the function (f/g)(x) only can take the values found in all three domains at once.
      3
............................................................0---------------------------------
←--------- -∞ +∞-------------→

Answer: (3,+∞)

7 0

3 years ago

Determine if the results of the following word problem adhere to the Law of Conservation of Mass. 1. A chemist combines 4.9 g of

KiRa [710]

Answer: The results agree with the law of conservation of mass

Explanation:

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. On the reactant side, the total mass of reactants is 14.3g and the total product masses is also 14.3g. That implies that no mass was !most in the reaction. The sum of masses on the left hand side corresponds with sum of masses on the right hand side of the reaction equation.

4 0

3 years ago

What is the [OH-],[H3O] and PH for the following

malfutka [58]

The values for hydroxide ions, hydronium ions and pH are found in the attached picture.

Explanation:

See the attached picture.

Learn more about:

brainly.com/question/1525823

#learnwithBrainly