For which of the following processes will \deltaδs be negative? pbcl2(s) = pb2+(aq) + 2 cl-(aq)mgo(s) + co2(g) = mgco3(s)co2(aq) = co2(g)c5h12(l) + 8 o2(g) = 5 co2(g) + 6 h2o(g)

Answer

a) : = +ve

b) : = -ve

c) : = +ve

d)  : = +ve

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

a)

As solid is moving to ions form , randomness increases and thus sign of is positive.

b)

As gaseous reactants are converted to solid products , randomness decreases and thus sign of  is negative.

c)

As liquid is changing to gas  randomness increases and thus sign of is positive.

d)

As 8 moles of gaseous reactants are converted to 11 moles of gaseous products , randomness increases and thus sign of is positive.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally

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