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Edexcel GCSE Chemistry · 1CH0

Specification 1.51 · Paper 1, Paper 2

The mass of one mole of a substance, measured in g mol⁻¹.
Its numerical value is the relative particle mass: for example, adding the relative atomic masses of Na (23) and Cl (35.5) gives a relative formula mass of 58.5, so the molar mass of NaCl is 58.5 g mol⁻¹. Different substances therefore have different masses per mole, even though every mole contains the same number of specified particles.
Revise: Moles and Particles Calculations
The mass of one mole of a substance, measured in grams per mole ( $\mathrm{g\,mol^{-1}}$ ).
Revise: Chemical Calculations: Ratios, Empirical Formulae & Moles

OCR GCSE Chemistry A · J248

Specification CM3.1i, CM3.1iv, C3.1g, C3.1h, C3.1l, CM5.1iii, C5.1a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

After dividing each mass by its corresponding molar mass, divide all the resulting amounts by the smallest. If necessary, multiply the entire ratio to obtain the smallest whole numbers, then use those numbers as the formula's subscripts.
Revise: Quantitative Arithmetic
The mass of one mole of a substance, measured in grams per mole (g/mol). Its numerical value is the same as the substance's $M_r$ .
Revise: Unit Conversions
The mass of one mole of a substance, normally measured in $\mathrm{g\,mol^{-1}}$ .
Revise: The Avogadro Constant and the Mole

4 more notes

The mass of one mole of a specified substance, usually measured in grams per mole, $\text{g mol}^{-1}$ .
Revise: Mass and Moles Relationship
The mass of one mole of a substance, usually expressed in g mol⁻¹.
Revise: Calculating Masses from Equations
The mass of one mole of a substance, usually expressed in $\text{g mol}^{-1}$ . Its numerical value equals the substance's $M_r$ .
Revise: Mass to Moles Conversion
The mass of one mole of a substance, found numerically from its relative formula mass and measured in $\mathrm{g\,mol^{-1}}$ .
Revise: Concentration Relationships

OCR Chemistry A past papers

OCR GCSE Chemistry B · J258

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The mass of one mole of a substance. Its value in g/mol is numerically equal to the substance's relative formula mass.
Revise: Mass to moles relationship
The mass of one mole of a substance, measured in grams per mole (g mol⁻¹). Its numerical value is the substance’s relative formula mass.
Revise: Changing subject of equation

OCR Chemistry B past papers

Exam tips

1
Convert the mass to grams before using a molar mass in g mol⁻¹.
2
Write units at every stage. The relative formula mass, $M_r$ , has no unit, whereas molar mass is expressed in $\mathrm{g\,mol^{-1}}$ .
3
When molar mass is in $\text{g mol}^{-1}$ , convert the sample mass to grams before calculating.

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

Specification 1.51 · Paper 1, Paper 2

The mass of one mole of a substance, measured in g mol⁻¹.
Its numerical value is the relative particle mass: for example, adding the relative atomic masses of Na (23) and Cl (35.5) gives a relative formula mass of 58.5, so the molar mass of NaCl is 58.5 g mol⁻¹. Different substances therefore have different masses per mole, even though every mole contains the same number of specified particles.
Revise: Moles and Particles Calculations
The mass of one mole of a substance, measured in grams per mole ( $\mathrm{g\,mol^{-1}}$ ).
Revise: Chemical Calculations: Ratios, Empirical Formulae & Moles

Edexcel Chemistry past papers

OCR GCSE Chemistry A · J248

Specification CM3.1i, CM3.1iv, C3.1g, C3.1h, C3.1l, CM5.1iii, C5.1a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

After dividing each mass by its corresponding molar mass, divide all the resulting amounts by the smallest. If necessary, multiply the entire ratio to obtain the smallest whole numbers, then use those numbers as the formula's subscripts.
Revise: Quantitative Arithmetic
The mass of one mole of a substance, measured in grams per mole (g/mol). Its numerical value is the same as the substance's $M_r$ .
Revise: Unit Conversions
The mass of one mole of a substance, normally measured in $\mathrm{g\,mol^{-1}}$ .
Revise: The Avogadro Constant and the Mole

4 more notes

The mass of one mole of a specified substance, usually measured in grams per mole, $\text{g mol}^{-1}$ .
Revise: Mass and Moles Relationship
The mass of one mole of a substance, usually expressed in g mol⁻¹.
Revise: Calculating Masses from Equations
The mass of one mole of a substance, usually expressed in $\text{g mol}^{-1}$ . Its numerical value equals the substance's $M_r$ .
Revise: Mass to Moles Conversion
The mass of one mole of a substance, found numerically from its relative formula mass and measured in $\mathrm{g\,mol^{-1}}$ .
Revise: Concentration Relationships

OCR Chemistry A past papers

OCR GCSE Chemistry B · J258

Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)

The mass of one mole of a substance. Its value in g/mol is numerically equal to the substance's relative formula mass.
Revise: Mass to moles relationship
The mass of one mole of a substance, measured in grams per mole (g mol⁻¹). Its numerical value is the substance’s relative formula mass.
Revise: Changing subject of equation

OCR Chemistry B past papers

Exam tips

1
Convert the mass to grams before using a molar mass in g mol⁻¹.
2
Write units at every stage. The relative formula mass, $M_r$ , has no unit, whereas molar mass is expressed in $\mathrm{g\,mol^{-1}}$ .
3
When molar mass is in $\text{g mol}^{-1}$ , convert the sample mass to grams before calculating.

Molar mass

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Revise Chemistry with GradeGen

Molar mass

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Revise Chemistry with GradeGen

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Related key terms

Revise Chemistry with GradeGen

Definition

How each exam board covers it

Edexcel GCSE Chemistry · 1CH0

OCR GCSE Chemistry A · J248

OCR GCSE Chemistry B · J258

Exam tips

Related key terms

Revise Chemistry with GradeGen