× × 2. 77.0% N 2 , 17.0% O 2 , 1.00 atm 1. Be sure to answer all parts. Radon (R

Question

×

×

2.

77.0% N2,

17.0% O2,

1.00 atm

1. Be sure to answer all parts.

Radon (Rn) is the heaviest and the only radioactive member of Group 8A(18), the noble gases. It is a product of the disintegration of heavier radioactive nuclei found in minute concentrations in many common rocks used for building and construction. In recent years, health concerns about the cancers caused from inhaled residential radon have grown. If 1.00

×

1015 atoms of radium (Ra) produce an average of 1.373

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104 atoms of Rn per second, how many liters of Rn, measured at STP, are produced per day by 0.88 g of Ra?

Explanation / Answer

Ans 1

Moles of Ra = mass/molecular weight

= 0.88 g / 226 g/mol

= 0.003894 mol

Moles of Rn produced

= 0.003894 mol Ra x ( 1.373 × 10^4 atoms of Rn) / (1× 10^15 atoms of Ra)

= 5.346 x 10^-14 mol Rn

At STP, 1 mole of any ideal gas occupies 22.4 L

Volume of Rn = 5.346 x 10^-14 mol x 22.4 L/mol

= 1.1975 x 10^-12 L

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