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A piece of jewelry contains 6.53 x 10^22 atoms of silver. How many moles of silver atoms? What is the ratio of the numbers of days in January to the number of days in a non-leap year? I have been studying differential equations I am about to take the practice section for differential equations how long can i give my self ? In how many distinct ways can the letters of the word SELLS be arranged? What would happen if we launched all our nuclear weapons at the sun?