1.

Calculate the weight of silver atoms that will contain the same number of atoms as are present in 3.175 g of copper metal

Answer»

Methane has a molecular weight of 16 and 4 atoms PER molecule. Oxygen (O2O2) has a molecular weight of 32 and 2 atoms per molecule.

32G of SOMETHING with a molecular weight of 16 is 2 moles — since there’s 4 atoms, that’s 8 moles of atoms. Since oxygen MOLECULES have 2 atoms each, 8 moles of atoms yields 4 moles of O2O2 molecules. Since they are 32g per mole of O2O2, 4 moles x 32g / mole = 128g

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