A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Feb/Mar 2025 · Q251 Mark
Two nitrates decompose on heating according to the equations shown. 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g) 2NH4NO3(s) → 2N2(g) + O2(g) + 4H2O(l) One mole of each nitrate is heated separately. The gas produced in each reaction is bubbled through NaOH(aq). The volume of any gas that does not react with NaOH(aq) is then collected and measured. Which nitrate: • shows the greater percentage loss in mass • produces the greater volume of gas collected?
ANH4NO3 NH4NO3
BNH4NO3 Pb(NO3)2
CPb(NO3)2 NH4NO3
DPb(NO3)2 Pb(NO3)2
✓ Correct answer
A: NH4NO3 NH4NO3
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