Because the decomposition is the reverse process of the formation.

Enthalpy is a function of state, which means that the value dependes only on the state and not the pathway.

Then the change of enthalpy is the same in magnitude for both cases but in formation the change is netavie (releases energy) and in the other is postive (absorbs energy).

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3 years ago

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Pb(NO3)2 how do i solve this

Sindrei [870]

You can see the periodic table one by one.

Pb(NO3)2 = PbN2O6

So there are

1Pb

and so you find the molecular mass from the periodic table and add all the numbers

Molacular mass of

Pb = 207

N = 14

O = 16

multiply it with the number of atoms

1Pb = 207 × 1 = 207

2N = 14 × 2 = 28

6O = 16 × 6 = 96

Molecular mass total = 207 + 28 + 96 = 331

So the molecular mass is 331.

4 0

3 years ago