Chemists can use moles to calculate: a. how much of the products are needed and how much reactant will be made. b. how much product will be made, but not how much of the reactants are needed. c. how much of the reactants are needed and how much product will be made. d. how much of the reactants are needed, but not how much product will be made.

c.- How much of the reactants are needed and how much product will made.

Explanation:

The moles is the matter unit used in chemistry to simplify  some calculations, instead of using grams. Also the moles are very useful because the chemical reaction can be balanced.

When a Chemical reaction is balanced, then it can be easily to calculate how many moles are necessary to add in a process to obtain a quantity of grams of a product.

This statement is TRUE.

The polarity of the molecule is caused by unequal sharing of the electrons in the covalent bond. Even though the carbon dioxide molecule is made from two different atoms, two oxygen atoms and one carbon atom, the CO2 molecule is non polar because of the structure of the molecule.
The CO2 has a linear, symmetrical structure. This means that the two oxygen atoms with greater electronegativity are symmetrically placed around the carbon molecule. This arrangement of atoms causes a balance in the sharing of the electrons, making the molecule non polar.