- Balance Zn + Sn2+ -> Zn2+ +Sn?

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How to Calculate the standard entropy? The first and second ionization constants of a diprotic acid H2A are Ka and Ka2 at a certain temperature.Under what conditions will [A2]=Ka2? If the radius of a neutron is 1.0×10−13cm, calculate the density of a neutron in g/cm3. (volume of a sphere = 43πr3)? 20 grams hydrogen in how many grams H2 molecule? Mass of 1g of C?