Chemistry, 10.07.2019 21:30 alarimer3695

What is the theoretical yield of bromobenzene in this reaction when 32.0 g of benzene reacts with 69.3 g of bromine?

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Answer from: fortnite83

First calculate the number of moles of bromine and benzene.

Number of moles = $\frac{given mass in g}{molar mass}$

Mass of benzene = 32.0 g (given)

Molar mass of benzene= 78.11 g/mol

Substitute the above values in formula, we get

Number of moles of benzene= $\frac{32.0 g}{78.11 g/mol}$

= 0.409 mol

Mass of bromine = 69.3 g

Molar mass of bromine = $2\times 79.9 g/mol$ = 159.8 g/mol

Substitute the above values in formula, we get

Number of moles of benzene= $\frac{69.3 g}{159.8 g/mol}$

= 0.43 g/mol

Now, ratio of benzene and bromine comes out be 1:1 respectively and limiting reagent is benzene because present less as compared to bromine.

Thus, number of moles of bromobenzene = 0.409 mol

Theoretical yield = $number of moles \times molar mass$

= $0.409 mol \times 157.02 g/mol$ (molar mass of bromonenzene = 157.02 g/mol)

= 64.22118 g

Hence, theoretical yield of bromobenzene is 64.22118 g

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

cock topography

the study of the surface of a large voluptuous cock.

look at that sorostitute right she's a cock topographer!

what classes are you taking this

cock topography!

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What is the theoretical yield of bromobenzene in this reaction when 32.0 g of benzene reacts with 69...

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