Igneous rocks form when minerals crystallize from cooling magma or lava. The more slowly the magma or lava cools, the larger the
crystals are able to grow.
The images below show two different igneous rocks. Examine the images, and then answer the question that follows.
Assuming that these images are shown at the same scale, which of the following can be concluded based on the information above?
A.
Rock X formed from magma; rock Y formed from lava.
B.
Rock Y cooled more slowly than rock X.
C.
Both rocks cooled at the same rate.
D.
Rock X cooled more slowly than rock Y.
The images below show two different igneous rocks. Examine the images, and then answer the question that follows.
Assuming that these images are shown at the same scale, which of the following can be concluded based on the information above?
A.
Rock X formed from magma; rock Y formed from lava.
B.
Rock Y cooled more slowly than rock X.
C.
Both rocks cooled at the same rate.
D.
Rock X cooled more slowly than rock Y.
1 answer:
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Answer:
Explanation:
Hello,
In this case, the enthalpy of combustion is understood as the energy released when one mole of fuel, in this case octene, is burned in the presence of oxygen and is computed with the enthalpies of formation of the fuel, carbon dioxide and water as shown below (oxygen is circumvented as it is a pure element):
Thus, since we already know the enthalpy of combustion of the fuel, for carbon and water we have -393.5 and -241.8 kJ/mol respectively, thereby, the enthalpy of combustion turns out:
Best regards.