This reaction is an example of __________. A. beta emission B. positron emission

Question

This reaction is an example of __________. A. beta emission B. positron emission C. alpha decay D. electron capture^131 I has a half - life of 8.04 days. Assuming you start with a 1.53 mg sample of^131 I, how many mg will remain after 13.0 days? A. 0.835 B. 0.499 C 0.450 D 0.228 Which of the following species is diamagnetic? A. a high - spin octahedral Fe^2+ complex B. an isolated V^3+ ion C. a Cu^2+ complex D. a low - spin octahedral Co^3+ complex How many d - electrons does the iron have in the [Fe(CN)_6]^3- complex? A. 3 B. 4 C. 5 D. 6

Explanation / Answer

28)

Balance mass number on both sides

mass of I = mass of Te + mass of ?

1*151 = 1*151 + M

M = 0

Balance atomic number on both sides

atomic of I = atomic of Te + atomic of ?

1*53 = 1*52 + A

A = 1

mass 0 and atomic number of 1 is for positron

So, it is positron emission

Answer: B

29)

Given:

Half life = 8.04 days

use relation between rate constant and half life of 1st order reaction

k = (ln 2) / k = 0.693/(half life)

= 0.693/(8.04)

= 8.619*10^-2 days-1

Given:

[I]o = 1.53 mg

use integrated rate law for 1st order reaction

ln[I] = ln[I]o - k*t

ln[I] = ln(1.53) - 8.619*10^-2*13

ln[I] = 0.4253 - 8.619*10^-2*13

ln[I] = -0.6091

[I] = 0.499 mg

Answer: B

i am allowed to answer only 1 question at a time

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