# 3. The half-life of 3P is t1/2 = 14.30 days. Suppose that mass of P is 32.00 amu.(a) Calculate the mass of 2P in 175.0-mg sample of Na35PO4(b) How long does it take for the amount of 32P to decrease to 2.713 mg in this sample?

Question help_outlineImage Transcriptionclose3. The half-life of 3P is t1/2 = 14.30 days. Suppose that mass of P is 32.00 amu. (a) Calculate the mass of 2P in 175.0-mg sample of Na35PO4 (b) How long does it take for the amount of 32P to decrease to 2.713 mg in this sample? fullscreen
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Step 1

(a)

Molar mass of Na332PO4 = 164.97 g/mol

Number of mol of Na332PO4  = given mass /molecular mass = 0.175 g/ 164.97 g/mol = 0.001 mol.

1 mol Na332PO4  contains 1 mol 32P.

Therefore, mass of 32P in 0.17...

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### Chemical Kinetics 