Nuclear Reactor Physics Qestions Please Help me

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Why dont you answer my Nuclear Reactor Physics Qestions? ...Please Help me

[/B]1 ) Dry air at normal temperature and pressure has a mass density of 0.0012 g/cm3 with a mass fraction of oxygen of 0.23. What is the atom density of 18O?


2) In the centre of the core of a 1000 MWe BWR, the observed fission rate is 1.7×1012 cm-3 s-1 and the observed temperature of the fuel is 800 oC. What will be the fission rate at the same location if the temperature is raised to 1000 oC? (Hint, Σf is a non- 1/v cross-section.)
 
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Astronuc
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[/B]1 ) Dry air at normal temperature and pressure has a mass density of 0.0012 g/cm3 with a mass fraction of oxygen of 0.23. What is the atom density of 18O?
Please show work. Determine the mole fraction of oxygen in air. Then apply the isotopic fraction of 18O.
 

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