Answer:
Aluminum is ideal for aircraft manufacture because it's lightweight and strong. Aluminum is roughly a third the weight of steel, allowing an aircraft to carry more weight and or become more fuel efficient. Furthermore, aluminum's high resistance to corrosion ensures the safety of the aircraft and its passengers.
Explanation:
<u>Formula to use:</u>

w = weight
m = mass
g = gravitational field strength.
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<u>Given</u>:
w = weight
m = 294.56
g = ?
<u>Solution:</u>


<u>Answer:</u>

Nitrogen by 78 percentage.
B, a physical change because it is not destroying the substance.