Higher Only
Zinc nitrate thermally decomposes to give two gases.
2Zn(NO3)2 (s) → 2ZnO (s) + 4NO2 (g) + O2 (g)
A student heats 1.89 g of zinc nitrate until there is no further reaction.
What is the total volume of gas measured at room temperature and pressure, made in this reaction?
• Assume that one mole of gas occupies a volume of 24 dm3 at room temperature and pressure.
• The molar mass of zinc nitrate is 189 g/mol.
0.12 dm3
0.48 dm3
0.60 dm3
1.20 dm3
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