We must first find the molar weight of Tungsten, found on the periodic table as 183.84g per mole.
We are told to find the mass of a sample containing 0.700 moles of Tungsten, so we can set this up in a multiplication equation and cancel units to find the mass in grams:
[tex] \frac{183.84g}{1mol} * \frac{0.700mol}{1} =128.688g[/tex]
So the answer that is closest to this value is C) 129g.
