What would be the mass of a sample containing 0.7 mol of pure tungsten? . 0.04 g. 51.8 g. 128.7 g. 262.6 g.

There are several information's of immense importance already given in the question. The answer to the question can be easily determined using those available information's. 

Mr of pure tungsten = 183.84
Mass of tungsten = Mole * Mr
                             = 0.7 * 183.84
                             = 128.7 gm
From the above deduction, it can be concluded that the correct option among all the options that are given in the question is the third option or the penultimate option.

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