Which one has the greatest mass?
1. 3.55 mol o atoms
2. 4.52 g o atoms
3. 0.0032 kg o2 molec
4. 7.39 × 1023 o2 molec

The correct answer is Option 1.

Explanation:

For the given options:

To calculate the number of moles, we use the equation:

Moles of Oxygen = 3.55 mol

Molar mass of Oxygen = 16 g/mol

Putting values in above equation, we get:

Mass of oxygen atoms = 56.8 g

Mass of oxygen atoms = 4.52 g

Converting this into grams, we use the conversion factor:

1 kg = 1000 g

So, 0.0032 kg = 3.2 g

Mass of molecule = 3.2 g

According to mole concept:

1 mole of an atom contains number of atoms.

If, number of atoms occupies 32 grams of oxygen molecule.

So, number of atoms will occupy =

Mass of molecule = 39.2 g

Hence, the greatest mass is coming out from option 1.

i think it's c. i'm not sure but i think so.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72