Question

What is the mass of 5.5 gram-atom of potassium

Answer 1

Answer:

One mole of any element contains

6.022×1023

atoms of that element. The molar mass of an element is the mass in grams of one mole of the element, which is its relative atomic mass (atomic weight) on the periodic table in g/mol.

Potassium, K has the relative atomic mass 39.0983

, therefore its molar mass is

39.0983 g/mol

.

We need to make the following conversions.

mass K

→

mol K

→

atoms K

Divide the given mass by molar mass, then multiply by

6.022

×

10

23

atoms/mol

.

3.40

g K

×

1

mol K

39.0983

g K

×

6.022

×

10

23

atoms K

1

mol K

=

5.24

×

10

22

atoms K

(rounded to three significant figures)

Explanation:

you can change it up for your question

Answer 2

Answer:

20K

Explanation: