Half-life of phosphorus- 32 and the mass of a sample of Na 3 32 PO 4 is given. By using these values, the mass of phosphorus left after 35.0 days is to be calculated. Concept introduction: In radioactive decay, the decomposition of a parent nuclide takes place and a new daughter nuclide is formed. Phosphorus- 32 is a commonly used radioactive nuclide in biochemical research. To determine: The mass of phosphorus left from an original sample of Na 3 32 PO 4 , of the given mass, after 35.0 days.

Question

An expression for the root mean square velocity, vrms, of a gas was derived. Using Maxwell’s velocity distribution, one can also calculate the mean velocity and the most probable velocity (mp) of a collection of molecules. The equations used for these two quantities are vmean=(8RT/πM)1/2 and vmp=(2RT/M)1/2 These values have a fixed relationship to each other.(a) Arrange these three quantities in order of increasing magnitude.(b) Show that the relative magnitudes are independent of the molar mass of the gas.(c) Use the smallest velocity as a reference for establishing the order of magnitude and determine the relationship between the larger and smaller values.

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Chapter 19, Problem 40E

Interpretation Introduction

Interpretation: Half-life of phosphorus- 32 and the mass of a sample of Na332PO4 is given. By using these values, the mass of phosphorus left after 35.0 days is to be calculated.

Concept introduction: In radioactive decay, the decomposition of a parent nuclide takes place and a new daughter nuclide is formed. Phosphorus- 32 is a commonly used radioactive nuclide in biochemical research.

To determine: The mass of phosphorus left from an original sample of Na332PO4 , of the given mass, after 35.0 days.

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