Answer:
The correct answer is -0.129 kJ
Explanation:
In the given case, the cooling of the balloon is done by withdrawing 0.784 J of heat, and the work done by the atmosphere on the balloon is 655 J. First, there is a need to transform kJ into J, 1 kJ = 1000 J. So, 0.784 kJ would be 784 J.
The ΔE or the change in the internal energy can be calculated by using the formula, ΔE = q + w ----- (1).
In the given case, q refers to the heat moved out of the system, that is, the value of q would be less than 0 or will be a negative quantity. Therefore, the heat moved out of the system will be -784 J. On the other hand, as the work or w is done on the system, therefore, the value of w would be more than 0 or will be a positive quantity. Thus, the value of w will be +655 J.
Now putting the values in the equation (1) we get,
ΔE = -784 J + 655 J
ΔE = -129 J or -0.129 kJ
As the change in internal energy comes out to be a negative value, therefore, the process is considered exothermic.
Gas, would be spread out everywhere, liquid would be loose, and solid would be compact tightly.
The pressure unit is in atmospheres or atm. To confirm this from the ideal gas equation:
R = VP/nT
plugging in the standard values of pressure, temperature and molar volume,
R = (22.4L/mo)l(1atm)/(273.15K) = 0.0821
The answer to the question asked above is heat energy<span> .
</span><span>The energy powering the movements of molecules is referred to as the heat energy of the system.</span>
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