Chemistry, 29.08.2019 05:30, kenzierosa

How many hydrogen atoms are present in 2.00mg of aspartame

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answered: olivasm5626

$7.37\times 10^{19}$ number of H atoms are present in 2.00 mg of aspartame

Explanation:

Molecular formula of aspartame is $C_{14}H_{18}N_{2}O_{5}$

So, 1 molecule of aspartame contains 18 atoms of H

Molar mass of aspartame = 294.307 g/mol

Number of moles = (mass)/(molar mass)

So, 2.00 mg of aspartame = $\frac{2.00\times 10^{-3}}{294.307}$ moles of aspartame

We know, 1 mol of a particle = $6.023\times 10^{23}$ number of particle

So, number of molecules of aspartame in $\frac{2.00\times 10^{-3}}{294.307}$ moles of aspartame = $\frac{2.00\times 10^{-3}}{294.307}\times 6.023\times 10^{23}$

So number of H atoms in $\frac{2.00\times 10^{-3}}{294.307}$ moles of aspartame = $\frac{2.00\times 10^{-3}}{294.307}\times 6.023\times 10^{23}\times 18$ = $7.37\times 10^{19}$

answered: Guest

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.

answered: Guest

Hairy thick gross thing? idk

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