Question

How many atoms are in 191 g of calcium

Answer 1

The Atoms in 191 g of calcium is
`\bold{2.869 * 10^(24)}` atoms Ca

Step-by-step explanation:

To calculate the number of atoms of Ca in 191 g Ca.

Convert the given mass of calcium to moles of calcium,

Using its molar mass (referring to a periodic table, this is 40.08gmol):

191g Ca×
`\left(\frac{1\ \mathrm{mol} \mathrm{Ca}}{40.08\ \mathrm{g} \mathrm{Ca}}\right)`=4.765 mol Ca

Using Avogadro's number,
`6.022 * 10^(23)` particles mol, calculate the number of atoms present

`4.765 \ mol\ Ca* \left(\frac{6.022 * 10^(23)}{1 \mathrm\ {mol} \mathrm\ {Ca}}\right)= 2.869 * 10^(24) atoms\ Ca`