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Sagot :
N2 (g) + O2 (g) =======> 2 NO (g) AH = 180kJ
Don't forget to balance the reaction.
This is an endothermic reaction because it needs heat to produce and the sign + of AH
Some reactions absorb enthalpy and others free heat.
We can find the mass of N2 using this enthalpy:
N2 (g) + O2 (g) =======> 2 NO (g) AH = 180kJ
x (grams) AH = 88 kJ
First, we calculate the molecular mass of N2:
Molar mass N2 = 28.01 g / mole so,
1 mol N2 = 28.01 g N2
Now:
28.01 g of N2 ----------------------- absorb 180kJ (stoichiometry)
x (we need this)----------------------- 88 kJ (is real)
[tex]x=\text{ }\frac{88kJ\text{ . 28.01 g N2}}{180kJ\text{ }}=13.69\text{ g of N2}[/tex]
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