Question

The atomic mass of potassium is 39.1. What is the mass of $6.022 \times {10^{23}}$ atoms of potassium?

Answer 1

The no. of moles of any compound is mainly the measure to determine the no. of atoms in that compound. One mole of any compound will always have $6.022 \times {10^{23}}atoms$ , this is Avogadro's number. This number of atoms is considered to form one mole of a substance; this is also the molar mass of the compound/element.

Complete Step By Step Answer:
Mole is the term used to denote a quantity that contains $6.022 \times {10^{23}}atoms$ (Avogadro’s number) of a substance/element/compound. These particles form one mole of any substance. The atomic mass is considered as the mass of a substance which contains these numbers of particles. As the molar mass increases the no. of molecules present in the compound decreases.
The mass of the substance that comprises the equivalent amount of the essential unit is known as a mole. For example, 12 grams of carbon will comprise 12 atoms of carbon. One mole of any substance is equal to Avogadro's number.
The mass of 1 mol of any substance in grams is equal to the atomic, molecular or formula mass in the amu unit (atomic mass unit)
Consider the molecule of water. It has two hydrogens and one oxygen molecule. The mass of hydrogen is 1.008 amu and that of oxygen is 15.999 amu. The sum of all three will be 18.015. Hence, we can say that the water molecule has a mass of 18.015 grams.
Similarly for potassium, which has the atomic mass of 39.1, the mass of beryllium atoms will also be 39.1 grams itself. One mole of potassium will be $6.022 \times {10^{23}}atoms$ . Hence the mass of $6.022 \times {10^{23}}atoms$ will also be 39.1 grams only.

Note:
The mole is just the number of particles in a compound. The particles are chemically indistinguishable but, exclusively, particular. Also, the atomic mass is known as molar mass which is the mass of 1 mol of the substance which is most probably the same value.