Question

Please tell me the answer + explain. (15 points)

Answer 1

2 RbNO₃

Rb = 2, N = 1, O = 6

BeF₂

Be = 1, F = 2

Explanation:

For the first reactant we have:

2 RbNO₃

The number "2" is related to the stoichiometry of the chemical reaction and it tell you how many molecules or moles ratio you have of the respective compound in respect with the other reactant.

Now we can calculate how many atoms of each type we have.

for Rb =  2 × 1 = 2 atoms

for N =  2 × 1 = 2 atoms

for O =  2 × 3 = 6 atoms

The second reactant is:

BeF₂

If is nothing before the compound we assume that the stoichiometry number is 1.

for Be = 1 × 1 = 1 atom

for F = 1 × 2 = 2 atoms

Learn more about:

number of atoms in a chemical formula

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