Question

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.

Answer 1

Answer:

Option C is the correct answer.

Explanation:

Standard atomic mass of tungsten = 183.84 u

1 u = 1.66 x 10⁻²⁴ g

1 mol = 6.02 x 10²³ atoms

Mass of 0.7 mol tungsten = 0.7 x 6.02 x 10²³ x 183.84 x 1.66 x 10⁻²⁴ = 128.7 g

Mass of 0.7 mol tungsten = 128.7 g

Option C is the correct answer.

Answer 2

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.