When an atom loses a valence electron, it becomes a(n) ion.
a, positive b, negative c, neutral d, polyatomic

A) Positive

Explanation:

Let's start with a term, atom. An atom is an important piece of matter that consists of three subatomic particles: protons, neutrons and electrons. An atom is neutral because because the number of protons equals the number of electrons. So what would happen if you gained or lost an electron. That atom would turn into an ion since it now has a charge. So if an atom loses an electron, there are more protons than electrons making it a positive ion. Similarly, if an atom gains an electron, then the electrons outnumber the protons, making it a negative ion. In this case, since the atom loses a valence electron, we end up with a positive ion.

Given:

Molar mass of CO2 = 44.01g/mol

3.21x10^25 molecules of CO2

Required:

Mass of CO2

Solution:

Avogadro’s number states that for every mole of atom, there are 6.023x10^23 units of atom. The units may be formula units, atoms. In here, you need to divide 3.21x10^25 molecules of CO2 to 6.023x10^23 molecules per mole.

3.21x10^25 molecules of CO2 / 6.023x10^23 molecules per mole = 53.30 moles CO2

53.30 moles CO2 (44.01g/mol CO2) = 2346 g of CO2