Bio question halllppp

[smiley00]

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hi. i ran into this problem....and am a lil confused. help would be appreciated 🙂

If the mass percent of oxygen in a nitrogenoxygen
compound is known, given the mass
percent of oxygen, all of the following are
needed to determine the molecular formula of
a nitrogen-oxygen compound EXCEPT one.
Which one is this EXCEPTION?
A. Atomic mass of nitrogen
B. Atomic mass of oxygen
C. Avogadro's number
D. Empirical formula​

E. Molar mass of the compound

The answer is D, I can see how it is D, but originally I thought it would be C. Why do we need Avogadro's #?? 😕

Thank you!! 😀

 

[HannibalLecter]

Yea we don't need to know either C or D. But my hunches would have landed on D since the type of question most relates to that. You really don't need avogadro's number for the percent mass problem.

Hopefully this helps.

 

[smiley00]

your hunches landed on the right answer and mine on the wrong :/ haha. thank you!!

 

[HannibalLecter]

well good trick to remember on these tricky science and reading questions, the easiest answer is easier to pick so its probably wrong. I double check my easy answers whenever I have to pick my answer choices. Just remember these guys are tricky in setting up an exam. I would be tricky too if I were making an exam like this and my 80,000 dollar job depended on it.

Edit: Wow I said tricky 4 times and I am sticking to it.

 

[smiley00]

lamo! i ll remember that when i take my tricky exam next week. and hopfully it doesnt get too tricky or it ll be tricky to get into dental school. 😛

 

[HannibalLecter]

What is this?!? is that supposed to be a mockup of The Lecter? Well good luck I am sure you will do fine

1) Review all your notes/flashcards
2) Take at least 3 practice tests
3) Get off SDN for this entire week - highly suggested
4) Chill the F out the day before
5) Listen to some fin techno on the way to the testing center

You will definitely get into dental school no matter what u 25er. 🙂

 

[smiley00]

haha u know i was kidding! lol. and thank you!!

 

[smiley00]

delete...i got it.