Answer:
11 molecules of CH4.
23 atoms of C is the leftover.
Explanation:
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In this case, for the formation of methane:

We can see there is an excess of carbon based on their stoichiometry, because the needed amount of hydrogen gas molecules would be:

Thus, the formed molecules of methane are computed below:

In such a way, the leftover of carbon atoms are:

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Percent error (%)= 
Accepted value is true value.
Measured values is calculated value.
In the question given Accepted value (true value) = 63.2 cm
Given Measured(calculated values) = 63.1 cm , 63.0 cm , 63.7 cm
1) Percent error (%) for first measurement.
Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.1 cm
Percent error (%)= 



Percent error = 0.158 %
2) Percent error (%) for second measurement.
Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.0 cm
Percent error (%)= 



Percent error = 0.316 %
3) Percent error (%) for third measurement.
Accepted value (true value) = 63.2 cm, Measured(calculated values) = 63.7 cm
Percent error (%)= 




Percent error = 0.791 %
Percent error for each measurement is :
63.1 cm = 0.158%
63.0 cm = 0.316%
63.7 cm = 0.791%
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Yes if you add an energy to an electron the electron will become excited, and it will jump to its highest level then go back down releasing energy