Please help! A) how many beta particles are emitted in 155 s by a 3.7 mg sample

Question

Please help! A) how many beta particles are emitted in 155 s by a 3.7 mg sample of ^60Co
B) what is the activity of the sample in Bq? Masteringohemistry: 10 x D Discussion B Homework Review i General Chen bbsi edu O session unasteringchemistry.com/myctveemviewrassignmentproblemID 76948698 CHEM 121b Spring 2017 Homework Problem 10 Part A How many beta partides are emitted in 155sby a 370 mg sample of GeCo? Cabat 60 which undergoes beta decay has a half lie of Bparticles Submit My Answers Give Up Incorrect. Try Again: 5 attempts remaining Part B What is the activity of the sample in Bo? O lype here to search Incorrect. Try Again: 4 attempts remaining

Explanation / Answer

A) The equation is

60C27 -----> 60Ni28 + 0e-1

Therefore, 1 beta particle is emitted.

B) A = (m/ma) NA (ln 2/t1/2)

where A = Amount of radioactivity in Bq

m = Mass of an isotope = 3.10 mg = 0.0037 g

ma = Atomic mass of an isotope = 59.93 g/mol

NA = Avagadro number = 6.022 X 1023 mol1

t1/2 = Half-life = 5.26 yr = 1.66 X 108 s

A = (m/ma) NA (ln 2/t1/2) = (0.0037/59.93) 6.022 X 1023(ln 2/1.66 X 108) = 1.55 X 1011 Bq

Activity of the sample = 1.55 X 1011 Bq

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---