A 0.25mol sample of a certain substance has a mass of 10g, what is the molar mass of this substance? Which element has the same molar mass?

Question

A 0.25mol sample of a certain substance has a mass of 10g, what is the molar mass of this substance? Which element has the same molar mass?

Answer 1

To find the Molar Mass of the substance you want to take

10 g / 0.25 mol = 40 g/mol

Then if you check a Periodic Table, the element with a molar mass closest to 40 g/mol is Calcium (Ca), which has a molar mass of 40.08 g/mol

Answer 2

10gr/.25mol = 40gr/mol for the substance.

 

Looking at the periodic table:

 

The closest for molar mass is Calcium with 40.07gr/mol.