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Chemical formulae, equations and calculations

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Question 70

Modern consumer aerosol products and electronic dusters often use hydrofluorocarbons (HFCs) as propellants because they do not deplete the stratospheric ozone layer. One commonly used gaseous HFC propellant has the following composition by mass:

Carbon: $36.4%36.4\%$
Hydrogen: $6.1%6.1\%$
Fluorine: $57.5%57.5\%$

Calculate the empirical formula of this compound. [Relative atomic masses: $C=12\text{C} = 12$ , $H=1\text{H} = 1$ , $F=19\text{F} = 19$ ]

[3]

The relative formula mass ( $M_r$ ) of this compound is 66. State its molecular formula.

[2]

Markscheme

Chemical formulae, equations and calculations Questions

IGCSE
Chemistry
Chemical formulae, equations and calculations

80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.

Chemical formulae, equations and calculations

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Chemical formulae, equations and calculations

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Question 70

Carbon: $36.4%36.4\%$
Hydrogen: $6.1%6.1\%$
Fluorine: $57.5%57.5\%$

Calculate the empirical formula of this compound. [Relative atomic masses: $C=12\text{C} = 12$ , $H=1\text{H} = 1$ , $F=19\text{F} = 19$ ]

[3]

The relative formula mass ( $M_r$ ) of this compound is 66. State its molecular formula.

[2]

Markscheme

Chemical formulae, equations and calculations Questions

IGCSE
Chemistry
Chemical formulae, equations and calculations

80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.