Iii) Predict which of the following has the largest atomic radius: potassium (K)

Question

Iii) Predict which of the following has the largest atomic radius: potassium (K) selenium (Se) rubidium (Rb) d. iv) Determine which of the species shown below are isoelectronic with neon, then decide which one of those you selected would be have the smallest radius. oxide ion argon magnesium ion: chloride ion e. What will be the values of quantum number 1 and m for n = 3 How much heat is required to raise the temperature of 79.0 g of ethanol from 298.0 K to 385.0 K? specific heat capacity of ethanol = 2.42 J/g middot degree C.

Explanation / Answer

e. For n =3

l ranges from 0 to n-1,

So, l = 0,1,2

m ranges from -l to +l

so, m = -2,-1,0,+1,+2

4.m = 79g

Initial temperature = 298K = 298-273 = 25C

Final temperature = 385K = 385-273 = 112C

DeltaT = 112-25 = 87C

Specific heat capacity,C = 2.42J/gC

Heat required = mCdeltaT

= 79g*2.42J/gC*87C

Heat = 16632.6J = 16.63kJ

Heat required to raise the temperature = 16.63kJ

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