Noble gases are supposed to be the least reactive elements so I’m assuming Neon would be the most least reactive out of all of them.
The answer to the question is C
Answer:
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Mass of X₂O₇ = 54,9g
2x + 33,6g = 54,9g
2x = 54,9g - 33,6g
2x = 21,3g | :2
x = 10,65g/mol
