(a)[2]
Give two reasons for fitting the crucible with the lid in a loose position.
(b)[2]
Fill in the results table.
(c)[1]
The crucible is heated for a further three minutes. The mass of the crucible, lid and contents is $11.5\text{ g}$. Explain why this is different from the value in the table.
(d)[1]
The total mass of carbon dioxide, $CO_2$, formed is $1.1\text{ g}$. Calculate the number of moles of $CO_2$ formed. $[M_r: CO_2 = 44]$
(e)[1]
The decomposition equation for the metal carbonate is given as $MCO_3 \rightarrow MO + CO_2$. Use this equation together with your answers to (b) and (d) to calculate the relative formula mass of $MCO_3$.
(f)[1]
Calculate the relative atomic mass, $A_r$, of metal $M$. $[A_r: C, 12; O, 16]$