High School

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A piece of potassium has a mass of 1.564 g.

(i) Calculate the number of moles in this piece of potassium. (Relative atomic mass of potassium [tex]= 39.1[/tex])

Answer :

To calculate the number of moles in a piece of potassium with a mass of 1.564 grams, you can use the formula:

[tex]\[ \text{moles} = \frac{\text{mass}}{\text{molar mass}} \][/tex]

Here are the steps:

1. Identify the Mass of Potassium:
The mass is given as 1.564 grams.

2. Identify the Molar Mass of Potassium:
The relative atomic mass of potassium is 39.1 grams per mole.

3. Apply the Formula:
Plug the values into the formula to find the number of moles:

[tex]\[ \text{moles} = \frac{1.564 \, \text{g}}{39.1 \, \text{g/mol}} \][/tex]

4. Calculate the Result:
Perform the division to find the number of moles:

[tex]\[ \text{moles} = 0.04 \][/tex]

Thus, the piece of potassium contains approximately 0.04 moles.

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