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Mars2501 [29]
3 years ago
9

How many moles of C8H18 contain 9.25 × 1024 molecules of C8H18 ?

Chemistry
1 answer:
fiasKO [112]3 years ago
3 0
<span>One mole of any material contains 6.02 * 10e23 atoms or molecules. This is the Avogadro number. So 9.25 * 10e24 atoms are contained in (9.25*10e24 / 6.02 * 10e23) = 15.36 moles. So the answer is that moles of C8H18 is 15.36 moles</span>
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5 0
3 years ago
Read 2 more answers
A chemical reaction that is first-order in X is observed to have a rate constant of 1.50 × 10–2 s–1. If the initial concentratio
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Answer:

0.053 M is the concentration of X after 196 seconds.

Explanation:

Initial concentration of the X = [A_o]=1.0 M

Time taken by the sample, t = 196 s

Final concentration of the X after t = [A] =?

Rate constant of the reaction = k = 1.50\times 10^{-2} s^{-1}

Formula used :

[A]=[A_o]\times e^{-kt}

where,

Now put all the given values in this formula, we get

[A]=[1.0M]\times e^{-1.50\times 10^{-2} s^{-1}\times 196 s}

[A]=0.053 M

0.053 M is the concentration of X after 196 seconds.

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