Răspuns:
Na2SO4 → Na2O + SO3 +Q
MNa2SO4=2x23+32+4x16=142g/mol
142g Na2SO4..................250 KJ
85g Na2SO4........................X KJ
X=85x250/142=149,64 KJ
Explicație:
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Răspuns:
Na2SO4 → Na2O + SO3 +Q
MNa2SO4=2x23+32+4x16=142g/mol
142g Na2SO4..................250 KJ
85g Na2SO4........................X KJ
X=85x250/142=149,64 KJ
Explicație: