Phosphorus-32 (3215P) decays by beta emission and it has a half-life of 14.3 days. Determine the activity (or decay rate) of 3215P in a 1.0-g sample of the compound K2H32PO4 (potassium hydrogen phosphate labeled with 32P; molar mass = 175.2 g/mol) and express the activity in curies (Ci) (Avogadro’s number, No = 6.022 x 1023/mol; 1Ci = 3.7 x 1010 cps = counts per second) (A) 5.2 x 104 Ci (B) 2.9 x 105 Ci (C) 1.7 x 106 Ci (D) 1.6 x 103 Ci

Answer - The correct option is (A) 5.2 x 104 Ci

Answered: Phosphorus-32 (3215P) decays by beta…

Chemistry

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ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter19: The Nucleus: A Chemist's View

Section: Chapter Questions

Problem 76CWP

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Phosphorus-32 (³²₁₅P) decays by beta emission and it has a half-life of 14.3 days. Determine the activity (or decay rate) of ³²₁₅P in a 1.0-g sample of the compound K₂H³²PO₄ (potassium hydrogen phosphate labeled with ³²P; molar mass = 175.2 g/mol) and express the activity in curies (Ci)

(Avogadro’s number, N_o = 6.022 x 10²³/mol;1Ci = 3.7 x 10¹⁰ cps = counts per second)

(A) 5.2 x 10⁴ Ci

(B) 2.9 x 10⁵ Ci

(D) 1.6 x 10³ Ci

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