Counting Atoms

Front

What is the formula to calculate the total number of atoms in a compound?

Back

Add the number of atoms of each element in the compound, considering the coefficients.

Front

How many atoms are in one molecule of water (H2O)?

Back

3 atoms (2 Hydrogen + 1 Oxygen).

Front

What does the subscript in a chemical formula indicate?

Back

The number of atoms of the element in one molecule of the compound.

Front

How many total atoms are in the compound Ca(CO3)2?

Back

9 atoms (1 Calcium + 2 Carbon + 6 Oxygen).

Front

How many atoms are in 3 molecules of water (3H2O)?

Back

9 atoms (3 x 3 = 9).

Front

What is the total number of atoms in COHF3?

Back

6 atoms (1 Carbon + 1 Oxygen + 1 Hydrogen + 3 Fluorine).

Front

How many atoms are in the compound C8H3O4?

Back

15 atoms (8 Carbon + 3 Hydrogen + 4 Oxygen).

Front

How many total atoms are in 2CH2?

Back

6 atoms (2 x (1 Carbon + 2 Hydrogen)).

Front

What is a coefficient in a chemical formula?

Back

A number placed in front of a compound to indicate how many molecules are present.

Front

How do you determine the number of atoms in a compound with parentheses?

Back

Multiply the number of atoms inside the parentheses by the subscript outside.