Twelve grams of carbon-12 atoms is defined as
A) one mole
B) a molar volume
C) the mole ratio
D) Avogadro's number

Hey there!

Molar mass is the mass of one mole of the substance.

The molar mass of carbon-12 is 12 grams, because this is the mass of one mole of the substance.

This means the answer is a) one mole.

Hope this helps!

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation: