the answer to this question is option a which is a compound.
it is because zoe is investigating the composition of substance a, an unknown substance.
using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1.
finally, she found that the substance is a compound.
carbon is the only element that can form so many different compounds because each carbon atom can form four chemical bonds to other atoms, and because the carbon atom is just the right, small size to fit in comfortably as parts of very large molecules.
answer: 31.55 g
- 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..