Silver Standard
The standard enthalpy change delta H^o for the thermal decomposition of silver nitrate according to?
the following equation +78.67 kJ:
AgNO3(s)–> AgNO2(s) + 1/2 O2(g)
The standard enthalpy of formation of AgNO3(s) is -123.02 kJ/mol. Calculate the standard enthalpy of formation of AgNO2(s)
The equation you want is:
ΔH⁰f (products) – ΔH⁰f (reactants) = ΔHrxn
The Heat of formation of any element in it’s standard state (such as O₂, H₂, etc) is 0.
Now plug in the values you know. Remember the coefficient in front of the substance dictates by what you have to multiply the heat of formation.
ΔH⁰f (products) – ΔH⁰f (reactants) = ΔHrxn
[ 1 mol* ΔH⁰f (AgNO2(s)) + .5mole * ΔH⁰f (O2(g)) ] – 1 mole* ΔH⁰f (AgNO3(s)) = ΔHrxn
[ΔH⁰f (AgNO2(s))+ .5 (0) ] – (-123.02 kJ) = 78.67 kJ
ΔH⁰f (AgNO2(s)) + 123.02 kJ = 78.67 kJ
ΔH⁰f (AgNO2(s)) = 78.67 kJ – 123.02 kJ = -44.35 kJ
ΔH⁰f (AgNO2(s)) = -44.35 kJ
China and the New Silver Standard
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