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3 years ago

Lead is listed below zinc in the activity series.

Chemistry

2 answers:

nikdorinn [45]3 years ago

3 0

Answer:

Zn+Pb(NO3)2→Zn(NO3)2+Pb

Natali5045456 [20]3 years ago

3 0

Answer: The chemical equation is written below.

Explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

$A+BC\rightarrow AC+B$

When lead nitrate is reacted with zinc metal, it leads to the formation of zinc nitrate and solid lead.

The chemical equation for the above reaction follows:

$Pb(NO_3)_2(aq.)+Zn(s)\rightarrow Zn(NO_3)_2(aq.)+Pb(s)$

As, zinc lies above in the reactivity series than lead, so it will easily displace lead from its chemical reaction.

Hence, the chemical equation is written above.

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w= - 1.7173 kJ, q= 1.7173 kJ, q(rev) = 1717.3 J = 1.7173 kJ.

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Okay, from the question we are given the information below;

Number of moles, n= 1 mole; initial volume, v(1) = 1.0 litres (L); pressure (p) = 5atm, final volume(v2) = 2.0 Litres(L) ; the workdone, w= not given; the heat, q and q(rev)= not given and the gas was said to expand isothermally.

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For expansion isothermally; the workdone, w= -nRT ln v2/v1.

Where T= temperature= 25° C = 298 k and R= gas constant.

Therefore; workdone, w = - 1 × 8.314 × 298 × ln(2/1).

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- 1717.3 Joules (J).

==> Workdone,w= - 1.7173 kJ.

Then, we are to find q. q can be solved by using the first law of thermodynamics, which by mathematical representation is:

∆U= q + w. Where ∆U= change in internal enegy. Since the question is dealing with isothermal expansion, there is this rule that says for an isothermal expansion ∆U = 0.

Hence, 0 =q + [- 1717.3 Joules (J)].

q=1717.3 J = 1.7173 kJ.

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q(rev) = 1 × 8.314 × 298 ln (2/1).

q(rev) = 1717.3 J = 1.7173 kJ.

PS: please note the negative signs in the workdone and the positive sign in the q(rev).

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