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Offlinestrangladesh
masterOFpuppets
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Registered: 10/17/05
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chem homework
    #5326610 - 02/22/06 12:01 AM (18 years, 1 month ago)

help plezzz
can some one help out, im haveing a hard time with this class...i think im on the right track but mabey some one can school me really quick...heres the quiz


Chapter 7 Quiz-2
Chemical Formula Relationships

Name__________________________ Date_____________________


(2pts) 1. Which of the following statements is incorrect? C

a) Molecular mass is expressed in amu
b) Formula mass compares the mass of one formula unit of a substance to the mass of one atom of carbon-12
c) Atomic mass has units of grams per atom
d) Both molecular mass and formula mass use carbon-12 as a reference standard
e) Sodium chloride, an ionic compound, is said to have a formula weight, but not a molecular weight


(2 pts) 2. Calculate the formula mass of aluminum carbonate
2-
Al CO
1 3
Al 1x26.98amu 26.98amu
C 1x12.01amu12.01amu
O 3x16.00amu44.00amu
82.99amu


(4 pts) 3. Calculate the percent composition of aluminum oxide
AlO

Al=






(2 pts) 4. How many grams of oxygen are in 8.50 g of formaldehyde, CH2O?

%O g O x 100 = (16.00)g O x 100=
g CH2O 8.50g CH2O

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InvisibleLiquidkick
H2O
Registered: 05/03/02
Posts: 2,635
Re: chem homework [Re: strangladesh]
    #5326615 - 02/22/06 12:03 AM (18 years, 1 month ago)

sorry my chemistry is a bit lacking, but if you have access to the quiz and its not due right away why don't you read thru the chapter again before doing it?

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Offlinestrangladesh
masterOFpuppets
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Registered: 10/17/05
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Re: chem homework [Re: Liquidkick]
    #5326628 - 02/22/06 12:08 AM (18 years, 1 month ago)

well ive answered 1,2 and part of 4, but this shit is really hard. its due tommarow morning and i just wanted some one to check my answers mabey give me a nudge in the right direction for 3,4

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InvisibleLiquidkick
H2O
Registered: 05/03/02
Posts: 2,635
Re: chem homework [Re: strangladesh]
    #5326640 - 02/22/06 12:11 AM (18 years, 1 month ago)

yeah sorry, i don't remember anything from chem. The last time i had chem was in 97 and 98.

I took chem1 and 2 and organ chem in HS. I do remembering breaking down multivitamins to see how much of each vitamin various pills had....

and made some candy canes too..

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