Answer:
2.52 ×10³ grams
Explanation:
First we need to know the molar mass of Neon which correesponds to the value of its atomic weight and is 20.180 grams/mol
To calculate the mass of 125 moles of Neon we must hence multiply the mass of one mol by the number of moles:
125 moles x 20.180 g/mol = 2522.5 grams
To write the result with the correct number of significant figures (three) you can write the result in scientific notation: 2.52 ×10³ grams