Calculate the mass of 2.25×1022 tungsten atoms. express the mass in grams to three significant figures

1 mole of an element = 6.02 x 10²³ atoms

That is 183.84 g of tungsten , contains 6.02 x 10²³ atoms

or 6.02 x 10²³ atoms=183.84 g of tungsten

6.02 x 10²³ atoms = 183.84 g

2.25 x 10²² atoms =

                                                             g of tungsten  

                                     = 6.87 g  

So, the mass of 2.25×10²² tungsten atoms is 6.87 g  .

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