If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride vapor, then

Options

A. `Delta H lt Delta U`
B. No relationship
C. `Delta H gt Delta U`
D. `Delta H = Delta U`

Answer

A

Explanation

`NH_(3(g)) + HCl_((g)) rarr NH_(4)Cl_((g))`
`Delta n` =no. of moles of product - no. of moles of reactant =1-2
`Delta n= -1`
Now, `Delta H = Delta E + Delta n_(g), RT, Delta H = Delta E-RT or Delta E = Delta H + RT`
`therefore Delta E gt Delta H (Delta E= Delta U)`= change in internal energy.