Chapter 10, Problem 104A

Interpretation Introduction

Interpretation:

Whether a mole of potassium or a mole of sodium has more mass should be determined with explanation.

Concept introduction:

Number of moles of a compound is defined as the ratio of given mass of the compound to the molar or molecular mass of the compound.

The mathematical expression is given by:

Number of moles = $\frac{\text{given mass of the compound}}{\text{molar mass of the compound}}$

The one mole of any substance is equal to the Avogadro number i.e. $6.022\times {10}^{23}$ atoms.

Answer to Problem 104A

Mass of one mole of potassium is greater than the mass of one mole of sodium.

Explanation of Solution

The mathematical expression is given by:

Number of moles = $\frac{\text{mass }}{\text{molar mass }}$

Number of moles of potassium = 1 mole

Number of moles of sodium = 1 mole

Molar mass of potassium = 39.1 g/mole

Molar mass of sodium = 23 g/mole

Number of moles of potassium = $\frac{\text{mass}}{\text{molar mass}}$

Put the values,

1 mole = $\frac{\text{mass}}{\text{39}\text{.1 g/mole}}$

Mass of potassium = $\text{39}\text{.1 g}$

Number of moles of sodium = $\frac{\text{mass}}{\text{molar mass}}$

Put the values,

1 mole = $\frac{\text{mass}}{\text{23 g/mole}}$

Mass of sodium = $\text{23 g}$

Thus, mass of one mole of potassium is greater than the mass of one mole of sodium.