Question

Show workk!!! pls

Radium is a
radioactive element
that decays into
radon gas. Its atomic
mass is 226. How
many moles in 497.2
grams of radium?

Answer 1

2.2moles

Step-by-step explanation:

Given parameters:

Atomic mass of Radium = 226

Mass of Radium = 497.2g

Unknown:

Number of moles = ?

Solution:

To solve this problem, we use the expression below:

Number of moles =
`(mass)/(molar mass)`

The molar mass of the radium = 226g/mol

So;

Number of moles =
`(497.2)/(226)` = 2.2moles