Chapter 10, Problem 85A

Interpretation Introduction

Interpretation:

A mole of silver with a mole of platinum needs to be compared on the basis of protons, neutrons, electrons and atoms.

Concept introduction:

In 1 mole of a substance there are $6.022\times {10}^{23}$ units. These units can be atoms or molecules. Atom is the smallest unit of matter or element. Protons, electrons and neutrons are subatomic particles having positive, negative and neutral charge on them.

Answer to Problem 85A

A mole of platinum has more protons, electrons and neutron but the same number of atoms as compared to 1 mol of silver.

Explanation of Solution

In 1 mol of any substance there are $6.022\times {10}^{23}$ units thus, 1 mol of platinum and 1 mol of silver both has $6.022\times {10}^{23}$ atoms. Therefore, both have same number of moles.

The atomic number and mass number of platinum is 78 and 195 respectively. Similarly, the atomic number and mass number of silver is 47 and 108 respectively.

The atomic number is equal to the number of electrons and protons. Thus, number of protons and electrons in platinum is 78 and that in silver is 47.

Also, mass number is equal to number of protons and number of neutrons thus, number of neutrons in platinum and silver will be:

$\begin{array}{l}{n}_{platinum}=195-78=117\\ n_{silver}=108-47=61\end{array}$

Conclusion

Thus, number of protons, electron and neutrons are more in case of platinum but, number of atoms is same as silver.