H2CO3(aq) + NH4OH(aq) --- (NH4)2CO3(aq) + H2O(l) When balancing the equation why there is a coefficient in front of the "H" in H2O? Why is beta-carotene colored, when most organic molecules are not? Why is Technetium-99m (the element, Technetium) a good radionuclide ...