Chemistry, 26.11.2019 00:31 bella122805

Amixture of gaseous co and h2, called synthesis gas, is used commercially to prepare methanol (ch3oh), a compound considered an alternative fuel to gasoline. under equilibrium conditions at 550.3 k, [h2] = 0.07710 mol/l, [co] = 0.02722 mol/l, and [ch3oh] = 0.0401 mol/l. what is the value of kc for this reaction at 550.3 k?

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Answer from: Queenofpizza

The value of K_c for the reaction at 550.3 K is 247.83

Explanation:

Equilibrium constant in terms of concentration is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as $K_{c}$

For a general chemical reaction:

$aA+bB\rightarrow cC+dD$

The expression for $K_{c}$ is written as:

$K_{c}=\frac{[C]^c[D]^d}{[A]^a[B]^b}$

The chemical equation for the production of methanol follows:

$CO+2H_2\rightleftharpoons CH_3OH$

The expression of K_c for above equation follows:

$K_c=\frac{[CH_3OH]}{[CO][H_2]^2}$

We are given:

[CH_3OH]=0.0401mol/L

[CO]=0.02722mol/L

[H_2]=0.07710mol/L

Putting values in above equation, we get:

$K_c=\frac{0.0401}{0.02722\times (0.07710)^2}\\\\K_c=247.83$

Hence, the value of K_c for the reaction at 550.3 K is 247.83

Answer from: Quest

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Answer from: Quest

im pretty sure its b

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Amixture of gaseous co and h2, called synthesis gas, is used commercially to prepare methanol (ch3oh...