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HW1-16 - 1-6 Fundamental Concepts Chap 1 16 A concrete with...

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1-6 Chap. 1 Fundamental Concepts 16. A concrete with a density of 2.35 gfcm3 has a hydrogen content of 0.0085 weight fraction. What is the atom density of hydrogen in the concrete? Solution: From Eq. (1.5), the atom density of hydrogen is wHpMa A(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 '~ ) 1/3 AFe 1/3 Du DPe = 1.62. ~ = Thus, Du ~ 1.62DFe. 18. By inspecting the chart of the nuclides, determine which element has the most stable isotopes? Solution: The element tin (Sn) has 10 stable isotopes.
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