CH-974

The mole

Chemistry · Secondary 3 · Hard · The mole

12.0 g of magnesium carbonate,

MgCO_3

, is completely decomposed by heating.

MgCO_3(s) \rightarrow MgO(s) + CO_2(g)

What is the mass of magnesium oxide formed? (

M_r(MgCO_3)=84,\ M_r(MgO)=40

)

2.86 g
5.72 g
8.00 g
12.0 g

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