Answer:
Neon (Ne) has the most stable outer electron configuration because the outer electron is completely filled and it has octet structure
Explanation:
The configuration of these elements is as follows;
Cl₁₇ = 2, 8,7 (the outer electron is 7)
Ca₂₀ = 2,8,8,2 (the outer electron is 2)
Ne₁₀ = 2,8 (the outer electron is 8)
Na₁₁ = 2,8,1 (the outer electron is 1)
Based on the outer electron value above, Neon (Ne) has the most stable outer electron configuration because the outer electron is completely filled and it has octet structure.
The concentration of a substance is the quantity of solute present in a given quantity of solution.
The statement that is
untrue concerning a reversible reaction is The reaction always spends equal time in the forward and reverse
direction. The answer is letter B. The reset of the statements are true
concerning the reversible reaction.
The Tyndall effect is used to identify a mixture as a colloid.
Answer:
Percentage yield = 25%
Explanation:
Given data:
Moles of C₈H₁₈ = 4 mol
Moles of O₂ = 4 mol
Actual yield of CO₂ = 28.16 g
Percentage yield = ?
Solution:
Chemical equation:
2C₈H₁₈ + 25 O₂ → 16CO₂ + 18H₂O
Now we will compare the moles of CO₂ with O₂ and C₈H₁₈.
C₈H₁₈ : CO₂
2 : 16
4 : 16/2×4=32 mol
O₂ : CO₂
25 : 16
4 : 16/25×4=2.56 mol
Mass of CO₂:
Mass = number of moles× molar mass
Mass = 2.56 mol ×44 g/mol
Mass = 112.64 g
Percentage yield:
Percentage yield = Actual yield /theoretical yield × 100
Percentage yield = 28.16 g / 112.64 g× 100
Percentage yield = 0.25× 100
Percentage yield = 25%
