Answer:
A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year. It's about 5.88 trillion miles (9.5 trillion km).
Explanation:
Answer:
1.34 × 10⁻⁵
Explanation:
Let's consider the acid dissociation of propanoic acid.
CH₃CH₂COOH(aq) + H₂O(l) ⇄ CH₃CH₂COO⁻(aq) + H₃O⁺(aq)
We can find the acid dissociation constant (Ka) using an ICE chart.
CH₃CH₂COOH(aq) + H₂O(l) ⇄ CH₃CH₂COO⁻(aq) + H₃O⁺(aq)
I 0.65 0 0
C -x +x +x
E 0.65 - x x x
We know that [CH₃CH₂COO⁻] = [H₃O⁺] = x = 2.95 × 10⁻³ M
[CH₃CH₂COOH] = 0.65 - 2.95 × 10⁻³ = 0.64705 M
Ka = [CH₃CH₂COO⁻].[H₃O⁺]/[CH₃CH₂COOH]
Ka = (2.95 × 10⁻³)²/0.64705
Ka = 1.34 × 10⁻⁵