Help, please in Ashby & Jones 2. (Atomic mass of Hydrogen is 1.01 g/mol; atomic

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Help, please

in Ashby & Jones 2. (Atomic mass of Hydrogen is 1.01 g/mol; atomic mass of Oxygen is 16 g/moi.) (Watch the units).The temperature at which ice nuclei form homogeneously from under-cooled water is - 40 degree C. Find r* given that gamma = 25 mJ m -2, |Delta H| = 335kJ kg-1, and T m = 273 K. Estimate the number of H2O molecules needed to make a critical-sized nucleus. Why do ponds freeze over when the temperature falls below 0 degree C by only a few degrees? [The density of ice is 0.92 Mg m -3. The atomic weights of hydrogen and oxygen are 1.01 and 16.00 respectively.]

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which formula we will use to do this

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