Question

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a bond forming Question 8 (1 point) For the decomposition of mercury(II) oxide, Hgo, to mercury and oxygen 2HgO(s) - 2Hg(1) + O2(g) What is the standard change in entropy for this reaction? S / J-mol-'K HgO(s) 70.29 Hg(1) 76.02 O2(g) 205.14 O216.60 JK-1 58.83 J-K-1 210.87 J-K-1 351.45 JK-1

Answer 1

Question 8)

$2HgO_(_s_)\rightarrow 2Hg_(_l_)+O_2_(_g_)$

Standard chnge in entropy= Sum of entropy of product - Sum of entrtopy of reactant

$\Delta S^\circ =[ 2*S^\circ (Hg)+S^\circ (O_2) ]-2*S^\circ (HgO)$

$\Delta S^\circ =[ 2*76.02+205.14 ]-2*70.29$

$\Delta S^\circ =[ 152.04+205.14 ]-140.58$

$\Delta S^\circ =216.6Jmol^-^1K^-^1$

option 1

Question 7)

$\Delta S<0$ means reaction is non spontaneous

Hence, among the folowing bond forming is the process which will be completed only in the presence of external energy

option 4

Question 6)

The following calibration curve is for weak acid and strong base.

Here,

From the graph,

option b) Weak acid $pK_a=6$

Question 5)

According to the concept of acis and base:

Acid is a proton donar species and base is a proton acceptor species.

Option 3) HCOOH and H₃O⁺