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3 years ago

A picture hanging on a wall has energy.

Chemistry

2 answers:

KonstantinChe [14]3 years ago

8 0

It has potential energy.

Kipish [7]3 years ago

6 0

Explanation:

Potential energy is defined as the energy present within an object due to its position.

Mathematically, P.E = mgh

where, m = mass of object

g = acceleration due to gravity

h = height of the object

Therefore, when a picture hanging on a wall then it is placed at a definite position from where it is not moving. Hence, the energy possessed by it will be potential energy.

Therefore, we can conclude that a picture hanging on a wall has potential energy.

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3 years ago

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1 C8H10(l) +21/2O2(g) → 8CO2(g) + 5H2O(g), Hcomb= ? Hf for C8H10(l) = +49.0kJ/mol C8H10(l) Use the balanced combustion reaction

nikklg [1K]

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$H_{comb}=-4406kJ/mol$

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):

$H_{comb}=8*\Delta _fH_{CO_2}+5\Delta _fH_{H_2O}-\Delta _fH_{C_8H_{10}}$

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:

$H_{comb}=8*(-393.5kJ/mol)+5(-241.8kJ/mol)-49.0kJ/mol\\\\H_{comb}=-4406kJ/mol$

Best regards.

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4 years ago