Difference between revisions of "Relative Formula Mass"

Revision as of 19:18, 2 January 2019

Key Stage 4

Meaning

The relative formula mass (M_r) of a molecule is the mass of one mole of molecules.

About Relative Formula Mass

The relative formula mass is used to find the mass of a molecule needed to perform a complete reaction with another chemical.

Calculating Relative Formula Mass

Relative formula mass can be calculated from the chemical formula of the molecule and the relative atomic mass of the elements.

Find the relative formula mass of O₂.	Find the relative formula mass of CO₂	Find the relative formula mass of C₆H₁₂O₆
Relative Atomic Mass of Oxygen = 16g No. Oxygen atoms = 2 Relative Formula Mass of O₂ = 16x2 Relative Formula Mass of O₂ = 32g	Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Oxygen = 16g No. Carbon atoms = 1 No. Oxygen atoms = 2 Relative Formula Mass of CO₂ = 12x1 + 16x2 Relative Formula Mass of CO₂ = 44g	Relative Atomic Mass of Carbon = 12g Relative Atomic Mass of Hydrogen = 1g Relative Atomic Mass of Oxygen = 16g No. Carbon atoms = 6 No. Carbon atoms = 12 No. Oxygen atoms = 6 Relative Formula Mass of C₆H₁₂O₆ = 12x6 + 1x12 + 16x6 Relative Formula Mass of C₆H₁₂O₆ = 180g

@@ Line 6: / Line 6: @@
 ===About Relative Formula Mass===
+: The '''relative formula mass''' is used to find the [[mass]] of a [[molecule]] needed to perform a complete [[Chemical Reaction|reaction]] with another [[chemical]].
+===Calculating Relative Formula Mass===
 : '''Relative formula mass''' can be calculated from the [[Chemical Formula|chemical formula]] of the [[molecule]] and the [[Relative Atomic Mass|relative atomic mass]] of the [[element]]s.
-: The '''relative formula mass''' is used to find the [[mass]] of a [[molecule]] needed to perform a complete [[Chemical Reaction|reaction]] with another [[chemical]].
+{| class="wikitable"
+|-
+| style="height:20px; width:200px; text-align:center;" |Find the '''relative formula mass''' of O<sub>2</sub>.
+| style="height:20px; width:200px; text-align:center;" |Find the '''relative formula mass''' of CO<sub>2</sub>
+| style="height:20px; width:200px; text-align:center;" |Find the '''relative formula mass''' of C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>
+|-
+| style="height:20px; width:200px; text-align:left;" |
+[[Relative Atomic Mass]] of [[Oxygen]] = 16g
+No. [[Oxygen]] [[atom]]s = 2
+[[Relative Formula Mass]] of O<sub>2</sub> = 16x2
+[[Relative Formula Mass]] of O<sub>2</sub> = 32g
+| style="height:20px; width:200px; text-align:left;" |
+[[Relative Atomic Mass]] of [[Carbon]] = 12g
+[[Relative Atomic Mass]] of [[Oxygen]] = 16g
+No. [[Carbon]] [[atom]]s = 1
+No. [[Oxygen]] [[atom]]s = 2
+[[Relative Formula Mass]] of CO<sub>2</sub> = 12x1 + 16x2
+[[Relative Formula Mass]] of CO<sub>2</sub> = 44g
+| style="height:20px; width:200px; text-align:left;" |
+[[Relative Atomic Mass]] of [[Carbon]] = 12g
+[[Relative Atomic Mass]] of [[Hydrogen]] = 1g
+[[Relative Atomic Mass]] of [[Oxygen]] = 16g
+No. [[Carbon]] [[atom]]s = 6
+No. [[Carbon]] [[atom]]s = 12
+No. [[Oxygen]] [[atom]]s = 6
+[[Relative Formula Mass]] of C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> = 12x6 + 1x12 + 16x6
+[[Relative Formula Mass]] of C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> = 180g
+|}