Convert 12.3g of AgNO3 to grams of Cu(NO3)2

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If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

What is the empirical formula for c4h8o2

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j