Answer:
This description needs a unit describing the system of measurement.
It would be HO2 Around there
Answer:

Explanation:
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In this case, since the enthalpy change for any process is computed by subtracting the enthalpy of the final state and the enthalpy of the initial state, for the given phase change, we subtract the enthalpy of the liquid (final state) and the enthalpy of the solid (initial state) considering this a melting process:

Which makes sense because this process absorbs energy.
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Answer:
See answer below
Explanation:
The picture below will show you the final product and mechanism.
In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.
As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.
The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.
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Answer is in the question light-year. this is the distance light travels in one year. A year is defined as the amount of time it takes for the earth to make its trip around the sun. So if it took 8 light-years then it took...