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pochemuha
3 years ago
10

Today, we have seven major continents. However, most geologists don't think it was like this 200 million years ago. They think t

here was just _____.
one supercontinent
two supercontinents
three separate continents
four separate continents
Chemistry
2 answers:
Oksanka [162]3 years ago
5 0
Yeah this is option A one supercontinent
basically a long time ago we would have lived on pangea

Eventually this would split into two and we would get Gondwana and also Laurasia, so thechnically option two would be a possible choice but option A is the most possible choice.
Alborosie3 years ago
4 0

Answer:

The correct answer is one supercontinent.

Explanation:

Geologists believe that more than 200 million years ago there was one supercontinent, which is a collection of all the different existing continents. Based on gelogical evidence and software technology the borders of the existing continent were given more accurate fits in the reconstruction of one large supercontinent.

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Explanation:

The chemical equation is as follows.

      \frac{1}{2}Cl_{2}(g) + \frac{1}{2}O_{2}(g) \rightarrow ClO(g)

And, the given enthalpy is as follows.

    \frac{1}{2}Cl_{2}(g) + O_{2}(g) \rightarrow ClO_{2}(g);  \Delta H = 102.5 kJ

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Since, the bond enthalpy of Cl-Cl is not given so at first, we will calculate the value of Cl-Cl as follows.

   \Delta H = \sum \text{bond broken in reactants} - \sum \text{bond broken in products}

    102.5 = [(\frac{1}{2})x + 498] - [(2)(243)]

    102.5 = (\frac{1}{2})x + 498 - 486

     102.5 - 12 = \frac{x}{2}

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Now, total bond enthalpy of per mole of ClO is calculated as follows.

       \Delta H = \sum E(\text{bond broken in reactants}) - \sum (\text{bond broken in products})

              x = [(\frac{1}{2})181 + (\frac{1}{2})498] - 243

                 = 339.5 - 243

                 = 96.5 kJ

Thus, we can conclude that the value for the enthalpy of formation per mole of ClO(g) is 96.5 kJ.

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