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HgO decomposes when exposed to heat: 2HgO ---> 2Hg + O2 \DeltaΔH = +181.6 What mass of O2 can be made with 100.0 kJ? Use 16 g/mol = O Your answer should be written with 3 significant figures.

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Answer:

17.6 g

Explanation:

Step 1: Write the balanced thermochemical equation for the decomposition of HgO

2 HgO ⇒ 2 Hg + O₂   ΔH = +181.6 kJ

Step 2: Calculate the moles of O₂ produced from 100.0 kJ

According to the balanced equation, 1 mole of O₂ is produced when 181.6 kJ are absorbed.

100.0 kJ × 1 mol O₂/181.6 kJ = 0.5507 mol O₂

Step 3: Calculate the mass corresponding to 0.5507 moles of O₂

The molar mass of O₂ is 32 g/mol.

0.5507 mol × 32 g/mol = 17.6 g

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