Question

1. How many moles are in 15.5 g of SO2

2. Find the mass of 1.50 mol C3H8?

3. How many moles is 1.50 x 1023 molecules of NH3 ?

4. Convert 2.50 x 1025 formula units of NaCl into grams.

5. Convert 3.60 mol CO2 into molecules

Answer 1

1. The number of mole in 15.5 g of SO₂ is 0.242 mole

2. The mass of 1.50 mole of C₃H₈ is 66 g

3. The number of mole of NH₃ that contains 1.5×10²³ molecules is 0.249 moles

4. The mass of NaCl that contains 2.5×10²⁵ formula units is 2429.4 g

5. The number of molecules present in 3.6 moles of CO₂ is 2.167×10²⁴ molecules

1. How to determine the mole of SO₂

• Mass of SO₂ = 15.5 g
• Molar mass of SO₂ = 32 + (2×16) = 64 g/mol
• Mole of SO₂ =?

Mole = mass / molar mass

Mole of SO₂ = 15.5 / 64

Mole of SO₂ = 0.242 mole

2. How to determine the mass of C₃H₈

• Mole of C₃H₈ = 1.5 mole
• Molar mass of C₃H₈ = 44 g/mol

• Mass of C₃H₈ =?

Mass = mole × molar mass

Mass of C₃H₈ = 1.5 × 44

Mass of C₃H₈ = 66 g

3. How to determine the mole of NH₃

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of NH₃

Therefore,

1.5×10²³ molecules = 1.5×10²³ / 6.02×10²³

1.5×10²³ molecules = 0.249 mole of NH₃

4. How to determine the mass of NaCl

6.02×10²³ units = 58.5 g of NaCl

Therefore,

2.5×10²⁵ units = (2.5×10²⁵ × 58.5) / 6.02×10²³

2.5×10²⁵ units = 2429.4 g of NaCl

5. How to determine the number of molecules

1 mole of CO₂ = 6.02×10²³ molecules

Therefore,

3.6 moles of CO₂ = 3.6 × 6.02×10²³

3.6 moles of CO₂ = 2.167×10²⁴ molecules

Learn more about Avogadro's number:

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