Understanding Ammonium Chromate Composition

The video tutorial explains how to find the number of atoms in ammonium chromate (NH4)2CrO4. It begins by introducing the compound and its ions, ammonium (NH4+) and chromate (CrO4^2-), and explains the need to balance their ionic charges. The tutorial then details how to count the atoms in the formula, considering the subscript outside the parentheses that applies to the ammonium ion. Finally, it sums up the total number of atoms: two nitrogen, eight hydrogen, one chromium, and four oxygen atoms, emphasizing the importance of applying the subscript to all elements within the parentheses.

What is the ionic charge of the ammonium ion (NH4) in ammonium chromate?

• -1

• +1

• +2

• -2

Why do we need two ammonium ions to balance the chromate ion in ammonium chromate?

• Because the chromate ion has a charge of -2

• Because the chromate ion has a charge of +2

• Because the ammonium ion has a charge of -2

• Because the ammonium ion has a charge of +2

How many nitrogen atoms are present in ammonium chromate?

• One

• Two

• Three

• Four

What is the total number of hydrogen atoms in ammonium chromate?

• Four

• Six

• Eight

• Ten

What is the total number of atoms in ammonium chromate?

• 10

• 18

• 12

• 15