The number of moles of 4.5g H2O is ？ ，and it will ？？ if temperature rises
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Answered by
0
Explanation:
Correct option is
A
−1.49×10
2
Solution:- (A) −1.63×10
2
J
Given mass of H
2
O
2
=4.5g
Molecular mass of H
2
O
2
=34g
No. of moles of H
2
O
2
=
34
4.5
=0.132 mol
2H
2
O
2
(l)
⟶O
2
(g)
+2H
2
O
(l)
From the reaction-
2 moles of H
2
O
2
produces 1 mole of O
2
, thus 0.132 mole of H
2
O
2
will produce 0.066 mole of O
2
.
Δn
g
=n
P
−n
R
=(0.066+0)−0=0.066 mol
∴ Change in volume =ΔV=Δn
g
×22.4=0.066×22.4=1.48
Pressure =1atm[Given]
As we know that,
Work done (W)=−PΔV=−(1×1.48)=−1.48L−atm=−1.49×10
2
J
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