Need chemistry help!!! = (

damm, i keep failing this stupid test cuz i cant freakin get the answers to these 3 questions right, and its the only test standing between me and graduation.

Can anyone help a tired mind out?


1)How many moles of magnesium oxide are formed when 4 moles of magnesium react with oxygen? Formula for this reaction:

2Mg+O2 > 2MgO

2)The formula for Potassium Dichromate is K2CrO7. How many grams of oxygen will be in 2 moles of Potassium Dichromate?


3)The formula for sugar is C12H22O11. How many moles of carbon are in 2 moles of sugar?


Correct answers will be greatly appreciated. Again, these are the only problems i seem to have difficulty with.

TankYu!

Grumble Grumble Grumble

And you want to be given the answers to such simple chemistry problems????

(The trick to these kinds of questions is to simply count whats going in, vs. what is coming out..)

as an example 1 mole of O2 contains 2 moles of O

so as your asked question, it would make a difference if it was Mg2 vs. 2 x Mg, the number of atoms of Mg are the same, but the number of molecules are different...

Anyway, to quote the Forum Rules...

Quote:

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Closing...

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Originally Posted by LenMiyata

Grumble Grumble Grumble

And you want to be given the answers to such simple chemistry problems????

(The trick to these kinds of questions is to simply count whats going in, vs. what is coming out..)

as an example 1 mole of O2 contains 2 moles of O

so as your asked question, it would make a difference if it was Mg2 vs. 2 x Mg, the number of atoms of Mg are the same, but the number of molecules are different...

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im completely lost when it comes to stoichiometry.

Chemistry is my worst subject, im way better at phiysics, and i like it alot more, but my counselor denied me physics and stuck me with chemistry instead, which im still furious about >= (

i already had the class but nooo!

anyway, thanks for the help mr. miyata! (^o^)

but im still cunfuzzled.

Grumble Grumble Grumble

And by the way, the answers are..

1. 4
2. 14 x (weight of a mole of oxygen)
3. 24

Try to understand how these answers were derived...