A new element has been produced, called Volunteerium (Vo). This unstable isotope

Question

A new element has been produced, called Volunteerium (Vo). This unstable isotope has 104 protons and 164 neutrons. It decays by alpha emission to Nobelium (No).

A new element has been produced, called Volunteerium (Vo). This unstable isotope has 104 protons and 164 neutrons. It decays by alpha emission to Nobelium (No). Answer the three questions below, using three signiticant tigures Part A: What is the atomic mass number (A) for the Nobelium that results from the decay of the Volunterium? Number A 264 (Enter a whole number value.) Part B: Suppose that 112 micrograms of Vo are initially produced, after 5.00 seconds, there are 56.0 micrograms remaining. How long does it take (t) before there are only 14.0 micrograms remaining? Number tr = | | 6.93 Part C: What is the decay constant (A) for Vo? Number = 113.47

Explanation / Answer

Vo (104, 268) --------à He(2, 4) + No(102, 264)

A) Atomic mass number for No = 264

B) Half life = 5.0 sec

     After 1 half cycle = 56 ug

     After 2 half cycle = 28 ug

    After 3 half cycle = 14 ug

   So time taken = 5*3 = 15 sec

C) decay constant = 0.693/t1/2 = 0.693/5 = 0.1386 sec^-1

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