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Sagot :
Answer
176.16 kJ
Explanation
Given:
Mass of NH3 = 10 grams
Equation: 4NH3 + 5O2-> 4NO + 6H2O ΔH = 1, 200 kJ
What to find:
The heat released when 10 grams of NH3 reacts with excess O2.
Step-by-step solution:
The first step is to convert the 10 grams of NH3 that reacts to mole using the mole formula
[tex]Mole=\frac{Mass}{Molar\text{ }mass}[/tex]Molar mass of NH3 = 17.031 g/mol
[tex]Mole=\frac{10g}{17.031\text{ }g\text{/}mol}=0.5872\text{ }mol[/tex]Now, you can use the mole of NH3 and the given equation to calculate the heat released.
From the equation;
4 moles of NH3 released 1,200 kJ of heat
Therefore, 0.5872 moles of NH3 will release
[tex]\frac{0.5872\text{ }mol\text{ }NH_3}{4\text{ }mol\text{ }NH_3}\times1200\text{ }kJ=176.16\text{ }kJ[/tex]Therefore, the heat released when 10 grams of NH3 reacts with excess O2 is 176.16 kJ
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