Question

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.

Answer 1

17.6 g

Step-by-step 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