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Topic: Relative Mass Question  (Read 3966 times)

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Offline quickie1

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Relative Mass Question
« on: September 03, 2014, 02:19:10 PM »
I don't know how to approach this problem.

You take three compounds, each consisting of two elements (X, Y, and/or Z), and decompose them to their respective elements. To determine the relative masses of X, Y, and Z, you collect and weigh the elements, obtaining the following data:

Elements in Compound...Masses of Elements

X and Y.. X=0.4g Y=4.2g
Y and Z...Y=1.4g Z=1.0g
X and Y....X=2.0g Y=7.0g

a. What are the assumptions needed to solve this problem?
b. What are the relative masses of X, Y, and Z?
c. What are the chemical formulas of the three compounds?
d. If you decompose 21 g of compound XY, how much of each element is present?

Offline Borek

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Re: Relative Mass Question
« Reply #1 on: September 04, 2014, 06:33:39 PM »
Do you know law of multiple proportions? See if it works for the data in table.
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Offline AdiDex

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Re: Relative Mass Question
« Reply #2 on: September 08, 2014, 12:55:58 PM »
The 3rd data that you given....
Please recheck it...
I think there should be X and z

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