what do you understand by transparent and opaque objects?
Answers
Answer:
Transparent Objects : If you are able to see clearly through an object,
For example :water,Opaque Objects : If we cannot see through an object at all, it is an opaque object. For example: wall etc.
Explanation:
hope this will help you
Explanation:
On reversing the first equation we get,
CO
2
(g)+2H
2
O(l)→CH
3
OH(l)+
2
3
O
2
(g); Δ
r
H
θ
=+726kJmol
−1
(on reversing the reaction, the sign of ΔH also reverses)
The second equation remains as such,
C
(graphite)
+O
2
(g)→CO
2
(g);Δ
c
H
θ
=−393kJmol
−1
On multiplying equation three by 2 we get,
2H
2
(g)+O
2
(g)→2H
2
O(l);2Δ
f
H
θ
=2×−286kJmol
−1
=−572kJmol
−1
On adding these three equations we get,
C
(graphite)
+2H
2
(g)+
2
1
O
2
(g)→CH
3
OH(l)
Enthalpy of formation of CH
3
OH=Δ
f
H=Δ
r
H
θ
+Δ
c
H
θ
+2Δ
f
H
θ
Δ
f
H=+726−393−572kJmol
−1
=−239kJmol
−1