3 years ago

Why do scientists use models?

1 answer:

4 0

Because it is a representation of data or maybe an object/process that is used to describe a certain data of phenomena that cannot be figured out directly.

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4 years ago

Consider the following reaction:2NOBr(g) 2NO(g) + Br2(g)If 0.412 moles of NOBr(g), 0.678 moles of NO, and 0.224 moles of Br2 are

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Answer: $K_c=0.0587M$

Explanation: The given chemical reaction is:

$2NOBr(g)\rightleftharpoons 2NO(g)+Br_2(g)$

Equilibrium constant (Kc) in general is written as:

$K_c=\frac{[products]}{[reactants]}$

Note:- Coefficients are written as their powers

So, the Kc expression for the above reaction will be:

$K_c=\frac{[NO]^2[Br_2]}{[NOBr]^2}$

Equilibrium moles are given for all of them. Let's divide the moles by given liters to get the concentrations.

$[NOBr]=\frac{0.412mol}{10.3L}$ = 0.040 M

$[NO]=\frac{0.678mol}{10.3L}$ = 0.0658 M

$[Br_2]=\frac{0.224mol}{10.3L}$ = 0.0217 M

Plug in the values in the equilibrium expression to calculate Kc.

$K_c=\frac{(0.0658M)^2(0.0217M)}{(0.040M)^2}$

$K_c=0.0587M$

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3 years ago