Counting Atoms

Front

What is the formula for calculating the number of atoms in a compound?

Back

To find the total number of atoms in a compound, sum the products of the coefficients and the subscripts for each element in the formula.

Front

In the compound Al₂(SO₄)₃, how many oxygen atoms are present?

Back

There are 12 oxygen atoms in Al₂(SO₄)₃.

Front

What is the product of the reaction 2H₂ + O₂?

Back

The product is 2H₂O.

Front

How many different elements are in the molecular formula C₆H₁₂O₆?

Back

There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

In the compound 3(NH₄)₂CrO₄, how many hydrogen atoms are there?

Back

There are 24 hydrogen atoms.

Front

How many magnesium atoms are in the formula 10MgCl₂?

Back

There are 10 magnesium atoms.

Front

What does a subscript in a chemical formula indicate?

Back

A subscript indicates the number of atoms of the element in the molecule.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in a reaction.

Front

How do you determine the number of atoms of an element in a compound?

Back

Multiply the subscript of the element by the coefficient in front of the compound.

Front

What is the total number of atoms in the compound C₃H₈?

Back

There are 11 total atoms (3 Carbon + 8 Hydrogen).