1-6Chap. 1Fundamental Concepts16. A concrete with a density of 2.35 gfcm3 has a hydrogen content of 0.0085weight fraction. What is the atom density of hydrogen in the concrete?Solution:From Eq. (1.5), the atom density of hydrogen iswHpMaA(H)(0.0085)(2.35 g/cm3)(6.022 x 1023 atoms/mol)N(H) ==1 gfmol= 1.20 X 1022 atoms/cm3,17. How much larger in diameter is a uranium atom compared to an iron atom?Solution:From Eq. (1.7) the nuclear diameter is D = 2RoAl/3 so that'~)1/3AFe1/3DuDPe= 1.62.~=Thus, Du ~ 1.62DFe.18. By inspecting the chart of the nuclides, determine which element has the moststable isotopes?Solution:The element tin (Sn) has 10 stable isotopes.
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