Question

A chemist weighed out 25.0g of tungsten. Calculate the number of moles of tungsten she weighed out.
Be sure your answer has the correct number of significant digits.

Answer 1

Answer:

0.136 mol

Step-by-step explanation:

The molar mass of tungsten is:

$M=183.84 g/mol$

which means that 1 mole of tungsten has a mass of 183.84 grams.

In this problem, the mass of the sample of tungsten here is

$m=25.0 g$

Therefore, we can find the number of corresponding moles of tungsten by using the equation:

$n=\frac{m}{M}$

And substituting the values that we have, we find:

$n=\frac{25.0}{183.84}=0.136 mol$

So, we have 0.136 moles of tungsten.