Question

Calculate the mass in grams of 0.167 moles of lithium hydroxide

Answer 1

Given:

Moles of lithium hydroxide = 0.167moles

To find:

Mass of lithium hydroxide in 0.167moles

Solution:

To calculate the mass, formula used is as follows,

     $Number of moles = \frac{given mass}{molecular mass}$

Here, Number of moles of LiOH = 0.167moles

         Molecular mass of LiOH = 23.95 gmol⁻¹

so, by substituting given values, we get

    given mass = number of moles × molecular mass

                         = 0.167 × 23.95

                         = 3.99g

Therefore, mass of LiOH = 3.99g

Alternate method to calculate mass of LiOH is-

1 mole of LiOH has molecular mass = 63.95 gmol⁻¹

0.167 moles of LiOH has mass = 63.95 × 0.167

                                                   = 3.99g

So, mass of LiOH is 3.99g.