Given the equation: __fecl2 + __na2co3 → __feco3 + __nacl when the equation is correctly balanced using the smallest whole numbers, the coefficient of nacl is

2 will be the number

Explanation:

To balance a chemical reaction like this one, we have to know the priority order of balance.

In general, the priority order for balancing is:

Metals > Non metals > Hydrogen > Oxygen

Following this order, we can balance almost any chemical reaction we have:

Now, using this priority, let's balance the equation.

The metals here are Fe and Na, so let's check both of them in both sides of the reaction.

In the case of Fe, we have the same number of atoms in reactants (1) and in the product, so, in theory, we do not need to balance this metal.

In the case of Na, we can see that in reactants we have 2 atoms, but in the products we have 1, so we need to put a number 2 next to the Na in the product. It will keep like this: 2NaCl. This 2, also alter the number of Cl, but we will see that later. We have the metals balanced.

Let's see the non metals which are Carbon and chloride. In the case of C, we have in both sides the same number of C (1). In the case of Chloride, we also have the same number on both sides (2), because we put a 2 in products to balance the Sodium, and this balance the chloride too. So non metals are balanced.

We do not have hydrogens, so, let's see the oxygen. We have 3 in reactants and 3 in products, so they are already balanced, so we do not need to balance.

The balanced equation will be:

FeCl₂ + Na₂CO₃ > FeCO₃ + 2NaCl

Therefore the coefficient of NaCl is 2.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms