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A salt crystal has a mass of 0.20 mg, How many NaCl formula units does it contain?

Question

A salt crystal has a mass of 0.20 mg, How many NaCl formula units does it contain?

check_circleAnswer
Step 1

Given:

Mass of NaCl = 0.20 mg = 2.0x10-4 g.

Molar mass of NaCl = 58.44 g/mol.

Step 2

Calculation for number of moles of NaCl:

mass
number of moles
molar mass
2.0 x 10 4
g
number of moles
58.44 g/mol
number of moles = 3.423 x 10-6 moles
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mass number of moles molar mass 2.0 x 10 4 g number of moles 58.44 g/mol number of moles = 3.423 x 10-6 moles

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Step 3

Calculation for N...

6.023 x 1023 units
1 mole of NaCl
3.423 x 10
x units
moles of NaCl
3.423 x 106mol NaCl x 6.023 x 1023 units
1 mole of NaCl
x = 2.062 x 1018 units
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6.023 x 1023 units 1 mole of NaCl 3.423 x 10 x units moles of NaCl 3.423 x 106mol NaCl x 6.023 x 1023 units 1 mole of NaCl x = 2.062 x 1018 units

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