Calcium Phosphite and Mole Calculations

This video tutorial explains how to count the number of atoms in calcium phosphite, Ca3(PO3)2. It covers the process of identifying the number of calcium, phosphorus, and oxygen atoms, considering subscripts and parentheses. The tutorial also demonstrates how to calculate the number of atoms in one mole of calcium phosphite using Avogadro's number. Additionally, it discusses the presence of phosphite ions in the compound.

What elements are present in calcium phosphite (Ca3(PO3)2)?

• Calcium, Phosphorus, Nitrogen

• Carbon, Phosphorus, Oxygen

• Calcium, Potassium, Oxygen

• Calcium, Phosphorus, Oxygen

How many calcium atoms are present in Ca3(PO3)2?

• 4

• 2

• 1

• 3

In the context of the video, what does the subscript '3' next to calcium indicate?

• There are three calcium ions

• There are three calcium compounds

• There are three calcium molecules

• There are three calcium atoms

What is the total number of atoms in one formula unit of Ca3(PO3)2?

• 9

• 10

• 11

• 12

How do you calculate the number of calcium atoms in one mole of Ca3(PO3)2?

• Multiply 3 by Avogadro's number

• Multiply 2 by Avogadro's number

• Multiply 6 by Avogadro's number

• Multiply 1 by Avogadro's number

How many phosphorus atoms are there in one mole of Ca3(PO3)2?

• 3

• 4

• 2

• 1

What is the role of Avogadro's number in mole calculations?

• It is used to convert grams to moles

• It is used to calculate molecular weight

• It is used to determine the volume of a gas

• It is used to find the number of atoms in a mole

How many phosphite ions are present in calcium phosphite?

• 4

• 2

• 3

• 1

What is the chemical formula for the phosphite ion?

• PO4 3-

• PO3 3-

• PO2 3-

• PO5 3-