62.054 grams of an unknown element make up 2.3 moles. Which element is it?

Question

62.054 grams of an unknown element make up 2.3 moles. Which element is it? 

Answer 1

Hello, Emha,

62.054 grams of an unknown element make up 2.3 moles. Which element is it? 

We can caklculate the molar mass: 62.054 grams/2.3 moles = 26.98 g mole. Since we are told this is an element, we simply need to find an elelemnt whose atomic mass is closest to 26.98 AMU. Hmmmm . . . Aluminum, Al, has an AMU of 26.98 AMU.

The unknown elelemnt is Al.

Bob