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3 Quantitative chemistry

This question is about the extraction of metals.

Element $X\text{X}$ is extracted from its dioxide by reduction with carbon monoxide.

The equation for the reaction is:

\text{XO}_2 + 2\text{CO} \rightarrow \text{X} + 2\text{CO}_2

The sum of the relative formula masses ( $M_r$ ) of the reactants ( $XO2+2CO\text{XO}_2 + 2\text{CO}$ ) is 136.

Calculate the relative atomic mass ( $A_r$ ) of $X\text{X}$ .

Relative atomic masses ( $A_r$ ): $C=12\text{C} = 12$ , $O=16\text{O} = 16$ .

[3]

Identify element $X\text{X}$ using the periodic table.

[1]

3 Quantitative chemistry Questions