<u>Answer:</u> The concentration of ethene is 0.286 M
<u>Explanation:</u>
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant =
t = time taken for decay process = 15.0 s
= initial amount of the reactant = 0.500 M
[A] = amount left after decay process = ?
Putting values in above equation, we get:
The concentration of reactant consumed = (0.500 - 0.357) M = 0.143 M
For the given chemical reaction:
1 mole of butene produces 2 moles of ethene
So, concentration of ethene = (2 × 0.143) M = 0.286 M
Hence, the concentration of ethene is 0.286 M
Answer:
<em><u> </u></em><em><u>YES</u></em><em><u> </u></em><em><u>STEEL</u></em><em><u> </u></em><em><u>CAN</u></em><em><u> </u></em><em><u>TURN</u></em><em><u> </u></em><em><u>INTO</u></em><em><u> </u></em><em><u>GAS</u></em><em><u> </u></em><em><u>.</u></em>
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Answer is: pH value of weak acid is 3.15.<span>
Chemical reaction: HA(aq) </span>⇄ A⁻(aq) + H⁺<span>(aq).
c(weak acid) = 0,5 M.
Ka(weak acid) = 1.0</span>·10⁻⁶.
[A⁻] = [H⁺] = x.
[HA] = 0.5 M - x.
Ka = [A⁻]·[H⁺] / [HA].<span>
</span>1.0·10⁻⁶ = x² / (0,5 M - x).
Solve quadratic equation: x = [H⁺] = 0.0007 M.
pH = -log[H⁺].
pH = -log(0.0007 M).
pH = 3.15.
The outer ear is responsible in carrying sound waves to the the tympanic membrane aka the eardrum, which vibrates when sound waves hit it.
Answer:
3
Explanation:
There are 3 significant figures and four decimal places. How do you know how many significant figures? Now let us convert the given number to standard form; we have 2.56*10^-2. Only the two significant figures were shown.