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

Answer:

2.2moles

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  = $\frac{mass}{molar mass}$

The molar mass of the radium   = 226g/mol

So;

       Number of moles  = $\frac{497.2}{226}$   = 2.2moles