Question

How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?

Answer 1

339 grams Rb

Step-by-step explanation:

To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).

Molar Mass (Rb) = 85.468 g/mol

2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole