Counting Atoms - Part 2

Front

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

Back

Add the subscripts of all elements in the chemical formula.

Front

How many total atoms are in K₂PO₄?

Back

7

Front

What does the subscript in a chemical formula represent?

Back

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

Front

How many sulfur (S) atoms are in Al₂(SO₄)₃?

Back

3

Front

What is the total number of oxygen (O) atoms in Al₂O₃?

Back

3

Front

How many hydrogen (H) atoms are in (NH₄)₂CrO₄?

Back

8

Front

How do you calculate the number of molecules in a given quantity of a compound?

Back

The number of molecules is equal to the coefficient in front of the compound.

Front

How many molecules are in 5 MgCl₂?

Back

5

Front

What is the significance of parentheses in chemical formulas?

Back

Parentheses indicate that the enclosed group of atoms is a polyatomic ion and the subscript outside applies to the entire group.

Front

How many total atoms are in the compound C₆H₁₂O₆?

Back

24 (6 Carbon + 12 Hydrogen + 6 Oxygen)