Answer:
Explanation:
5)
Given data:
Mass of FeS₂ = 3.8 g
Mass of SO₂ = ?
Solution:
Chemical equation:
4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂
Number of moles of FeS₂:
Number of mole = mass / molar mass
Number of mole = 3.8 g / 119.98 g/mol
Number of moles = 0.03 mol
Now we will compare the moles of SO₂ with FeS₂.
FeS₂ : SO₂
4 : 8
0.03 : 8/4 ×0.03 = 0.06
Mass of SO₂:
Mass = number of moles × molar mass
Mass = 0.06 mol × 64.066 g/mol
Mass = 3.84 g
6)
Given data:
Mass of SO₃ form = ?
Mass of SO₂ react = 4.1 g
Solution:
Chemical equation:
2SO₂ + O₂ → 2SO₃
Number of moles of SO₂ :
Number of moles = mass/ molar mass
Number of moles = 4.1 g/ 64.066 g/mol
Number of moles = 0.064 mol
Now we will compare the moles of SO₃ with SO₂.
SO₂ : SO₃
2 : 2
0.064 : 0.064
Mass of SO₃:
Mass = number of moles × molar mass
Mass = 0.064 mol × 80.066 g/mol
Mass = 5.12 g
7)
a)
Given data:
Mass of glucose = 10 g
Mass of CO₂ formed = ?
Mass of H₂O formed = ?
Solution:
Chemical equation:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 10 g/ 180.156 g/mol
Number of moles = 0.06 mol
Now we will compare the moles of sugar with each product.
C₆H₁₂O₆ : CO₂
1 : 6
0.06 : 6×0.06 = 0.36 mol
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 0.36 mol × 44 g/mol
Mass = 15.84 g
C₆H₁₂O₆ : H₂O
1 : 6
0.06 : 6×0.06 = 0.36 mol
Mass of H₂O:
Mass = number of moles × molar mass
Mass = 0.36 mol × 18 g/mol
Mass = 6.48 g
b)
Number of moles of CO₂ = 0.36 mol
Number of moles of H₂O = 0.36 mol
Number of molecules of CO₂ = ?
Number of molecules of H₂O = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ molecules of water
0.36 mol × 6.022 × 10²³ molecules of water / 1 mol
2.17 × 10²³ molecules of water
For CO₂:
1 mole = 6.022 × 10²³ molecules of CO₂
0.36 mol × 6.022 × 10²³ molecules of CO₂ / 1 mol
2.17 × 10²³ molecules of CO₂
