Question
Asked Nov 11, 2019
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Suppose you have a sample of sodium weighing 11.50 g. How many atoms of sodium are present in the sample? What mass of potassium would you need to have the same number of potassium atoms as there are sodium atoms in the sample of sodium?
 

 

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Expert Answer

Step 1

Given,

Sodium weight 11.50 g

Molar mass o...

Number of moles of sodium is calculated as follows,
Mass
Moles
Molar mass
11.50g
Moles
22.99 g/ mole
Moles 0.500
Avogadro number
One mole has Avogadro number (6.023 x 103) of formula unit
Number of sodium atoms present in the sample is calculated as follows,
Number of sodium atoms moles xAvogadro number
Number of sodium atoms 0.500x6.023x1023
Number of sodium atoms =3.012x1025
Number of sodium atoms present in the sample is calculated.
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Number of moles of sodium is calculated as follows, Mass Moles Molar mass 11.50g Moles 22.99 g/ mole Moles 0.500 Avogadro number One mole has Avogadro number (6.023 x 103) of formula unit Number of sodium atoms present in the sample is calculated as follows, Number of sodium atoms moles xAvogadro number Number of sodium atoms 0.500x6.023x1023 Number of sodium atoms =3.012x1025 Number of sodium atoms present in the sample is calculated.

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