The quantity of heat that raises the temperature of 1g of pure water 1oC.

30.11×10²³ atoms of K

Explanation:

Given data:

Mass of K = 195.49 g

Number of atoms of K = ?

Solution:

First of all we will calculate the number of moles of K.

Formula:

Number of moles = mass / molar mass

Molar mass of K = 39.1 g/mol

By putting values,

Number of moles = 195.49 g/ 39.1 g/mol

Number of moles = 5 mol

Number of atoms:

According to Avogadro number 1 mole contain 6.022×10²³ atoms.

5 mol × 6.022×10²³ atoms / 1 mol

30.11×10²³ atoms of K