Question

How many kJ of heat are released when 5.75 g of BaO (s) is produced?

Answer 1

Step-by-step explanation

Given

Mass of BaO produced = 5.75g

Required: Heat released when BaO is produced

Solution

Step 1: Calculate the energy released per mole of BaO

BaO has a coefficient of 2, meanibg there are 2 moles.

`\begin{gathered} k\text{ = }\frac{-1107\text{ kJ}}{2\text{ moles}} \\ k\text{ = -553.5 kJ/mole} \end{gathered}`

Step 2: Calculate the number of moles of BaO

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 5.75g/153.33 g/mol

n = 0.0375 mol

Step 3: Calculate the energy released

`\begin{gathered} \delta H=nk \\ \text{ = 0.0375 mol x \lparen-553.5 kJ/mol\rparen} \\ \text{ = -20.76 kJ} \end{gathered}`

Answer

Energy released = 20.8 kJ