Question

How many moles of PbS are equivalent to 458 g PbS?

Answer 1

Moles = Mass/Molar Mass

By this formula
458/207+32 you should get your answer
The ans. is 1.916 mol to 4 sig. Fig.

Answer 2

Answer:

1.914 mol

Explanation:

Use the following convert to convert mass to moles.

Moles = $\frac{mass}{molar mass}$.

Given,

Mass of PbS = 458 g

Molar mass of PbS = 239.3 g/mol

Moles of PbS = $\frac{Mass of PbS}{Molar mass of PbS }$

                       = $\frac{458 g}{239.3 g/mol }$= 1.914 mol

1.914 moles of PbS are equivalent to 458 g PbS