A chemical reaction that is first order in x is observed to have a rate constant of 1.2 x 10-2/s. If the initial concentration of x is 2.0 M, what is
the concentration of x after 200 s?
0.50 M
O 0.25 M
O 0.18 M
O 0.12 M
Question 9

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Ответ:

niniaalvarez

09.08.2020

Chemistry

Ce concentration = 0.0387 M

Explanation:

The given compound is: (NH₄)₂Ce(NO₃)₆

Mass = 10.6192 g

Mol. wt = 548.23 g/mol

$Moles = \frac{Mass}{Mol.wt}=\frac{10.6192g}{548.23g/mol}=0.01937$

Based on the formula stoichiometry:

1 mole of (NH₄)₂Ce(NO₃)₆ contains 1 mole of Ce

Therefore, there are 0.01937 moles of Ce in the given compound

Volume of the solution = 500.0 ml = 0.500 L

$Molarity = \frac{Moles}{Volume}=\frac{0.01937moles}{0.500L}=0.0387 M$

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A chemical reaction that is first order in x is observed to have a rate constant of 1.2 x 10-2/s. If the initial concentration of x is 2.0 M, what is the concentration of x after 200 s? 0.50 M O 0.25 M O 0.18 M O 0.12 M Question 9