(a) when 1/2N2(g)+3/2H2(g)?NH3(g) for NH3(g) find the value of ?H?f. (b) when S(s)+O2(g)?SO2(g) For SO2(g) find...

(a) when 1/2N2(g)+3/2H2(g)?NH3(g)

for NH3(g) find the value of ?H?f.

(b) when S(s)+O2(g)?SO2(g)

For SO2(g) find the value of ?H?f.

For RbClO3(s) find the value of ?H?f.

Solutions

Expert Solution

The molar enthalpy of formation of a compound is the enthalpy change (heat) during the reaction of formation of 1 mole of the compound from its elements in their standard states (P=1 atm).

1 molecule of NH₃ contains 1 N atom and 3 H atoms. The standard states of N and H are N₂(g) and H₂(g), respectively.

The molar enthalpy of formation of NH₃ is the enthalpy change during the reaction of formation of 1 mole of NH₃ from N₂(g) and H₂(g).

1 molecule of SO₂ contains 1 sulfur atom and 2 oxygen atoms. The standard states of sulfur and oxygen are S(s) and O₂(g), respectively.

The molar enthalpy of formation of SO₂ is the enthalpy change during the reaction of formation of 1 mole of SO₂ from S(s) and O₂(g).

1 molecule of RbClO₃ contains 1 Rb atom, 1 Cl and 3 O atoms. The standard states of Rb and Cl, and O are Rb(s), Cl₂(g) and O₂(g), respectively.

The molar enthalpy of formation of RbClO₃ is the enthalpy change during the reaction of formation of 1 mole of RbClO₃from Rb(s), Cl₂(g) and O₂(g).

queen_honey_blossom answered 1 year ago

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