Answer: 31.55 g
Explanation:
- The mass number of Fluoride atom (F) = 18.99 g/mol, so mass number of fluorine gas (F2) = 37.98 g/mol.
- 1 mole of (F2) [which has 37.98 g/mol] contains Avogadro’s number of molecules (6.02×10^23 molecules),
so 1 mole of (F2) with 37.98 g/mol → 6.02×10^23 molecules.
- Using cross multiplication,
37.98 g/mol of (F2) → 6.02 ×10^23 molecules
? → 5.00 ×10^23 molecules
Hence the mass of 5.00×10^23 molecules of F2 = (37.98 × 5.00 × 10^23) / 6.02 ×10^23 = 31.55 g..
Mass measures the amount of matter in an object
Answer: 
or 
Explanation: Given molar mass of Iron(III)oxide is 159.7 g/mol. It means the mass of 1 mol of Iron(III)oxide is 159.7 g.
How to write the molar mass as a conversion factor is all depends if we are calculating the moles or grams.
If the grams are given and we are asked to calculate the moles then the conversion factor is written as and if the moles are given and we are asked to calculate the grams then the conversion factor is written as .
