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Determine the number of atoms or molecules using the ff. formula:
# of atoms= n X N. # of molecules= n X N
Wherein:
# of atoms = element
# of molecules = compound / ions
n= number of moles
N= Avogadros Number which is constant 6.02X1023atoms/mole or
6.02x1023molecules/mole



1.How many atoms are in 18 moles of Magnesium (Mg)?
2.How many atoms are contained in 560g Iron (Fe)?
3.How many ions are contained in 8 moles of Silver Chloride, AgCl?
4.Calculate the number of molecules in 35g of Sodium Hydroxide (NaOH)?



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Sagot :

Solution (1)

no. of atoms = n × N

no. of atoms = 18 mol × 6.02 × 10²³ atoms/mol

[tex]\boxed{\text{no. of atoms = 1.08 × 10²⁵ atoms}}[/tex]

Solution (2)

Step 1: Calculate the number of moles of Fe.

[tex]n = \frac{m}{MM}[/tex]

[tex]n = \frac{\text{560 g}}{\text{56 g/mol}}[/tex]

[tex]n = \text{10 mol}[/tex]

Step 2: Calculate the number of atoms of Fe.

no. of atoms = n × N

no. of atoms = 10 mol × 6.02 × 10²³ atoms/mol

[tex]\boxed{\text{no. of atoms = 6.02 × 10²⁴ atoms}}[/tex]

Solution (3)

no. of ions = n × N

no. of ions = 8 mol × 6.02 × 10²³ ions/mol

[tex]\boxed{\text{no. of ions = 4.82 × 10²⁴ ions}}[/tex]

Solution (4)

Step 1: Calculate the molar mass of NaOH.

MM = (23 g/mol × 1) + (16 g/mol × 1) + (1 g/mol × 1)

MM = 40 g/mol

Step 2: Calculate the number of moles of NaOH.

[tex]n = \frac{m}{MM}[/tex]

[tex]n = \frac{\text{35 g}}{\text{40 g/mol}}[/tex]

[tex]n = \text{0.875 mol}[/tex]

Step 3: Calculate the number of molecules of NaOH.

no. of molecules = n × N

no. of molecules = 0.875 mol × 6.02 × 10²³ molecules/mol

[tex]\boxed{\text{no. of molecules = 5.27 × 10²³ molecules}}[/tex]

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