Understanding Relative Formula Mass in Chemistry

The video tutorial explains the concept of relative formula mass, also known as relative molecular mass, and its significance in chemistry. It demonstrates how to calculate the relative formula mass using examples like carbon dioxide and magnesium hydroxide. The tutorial emphasizes the importance of the law of conservation of mass in ensuring that chemical equations are balanced, showing that the sum of the masses of reactants equals the sum of the masses of products.

What is the relative formula mass also known as?

• Molar volume

• Molecular weight

• Atomic number

• Chemical symbol

Why is the relative formula mass important in chemical equations?

• It predicts the reaction speed.

• It determines the color of the compound.

• It ensures the equation is balanced according to the law of conservation of mass.

• It helps in identifying the elements in a compound.

How do you find the atomic mass of an element for calculating relative formula mass?

• By looking at the periodic table

• By measuring the element's density

• By observing the element's color

• By calculating the element's volume

What is the relative formula mass of carbon dioxide?

• 32

• 60

• 28

• 44

In magnesium hydroxide, what does the subscript outside the brackets indicate?

• The number of hydroxide ions

• The number of hydrogen atoms

• The number of magnesium atoms

• The number of oxygen atoms

What is the relative formula mass of magnesium hydroxide?

• 58

• 44

• 80

• 24

What does the balanced equation of magnesium and oxygen demonstrate?

• The law of conservation of mass

• The law of definite proportions

• The law of multiple proportions

• The law of constant composition