NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 1 of 3111
Question MCQ▾
When 50 g of iron is dissolved in HCl at 25°C in an open vessel and atmospheric pressure is 1 atm, calculate the work done?
Choices
Choice (4) | Response | |
---|---|---|
a. | -22.123 J | |
b. | -21.84 J | |
c. | 22.123 J | |
d. | -2212.39 J |
Answer
b.
Explanation
When iron is dissolves in HCl, hydrogen is produced
Fe + 2HCl ⇾ FeCl2 + H2
From the ideal gas equation PV = nRT
From the given data
n = weight/molecular weight
=
By substituting the values in above equation
This is equal to volume change when reaction is carried out in open beaker.
Work done by the system W =-P ∆ V
=-1.0
=-2212.39J.
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