The molar heat of fusion for Gold is 12.5 kJ/mol. The specific heat capacity of gold is 0.129 J/g oC.
Calculate the amount of energy required to melt 66.9 g of solid Gold and then heat the liquid to 1213 oC? The melting point of gold is 1063 oC.

Asample contains 16.75 g of the radioisotope u-236 and 50.25 g of its daughter isotope, th-232. how long did it take for decay to take place if one half-life of u-236 is 23 million years? 46 million years 69 million years 92 million years 115 million years

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What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?