March 28, 2024, 07:42:24 AM
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Topic: Can some one solve this so I can check my work? (no solution - just answers)  (Read 2850 times)

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Offline roneddy

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A sample of 1.5g of Copper (I) oxide and copper (II) oxide is heated in hydrogen gas to give 1.298g of pure copper metal. Calculate the percent composition by mass of the two copper compounds in the sample.

Offline Borek

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Please read the forum rules.

You have to show your attempts at solving the question to receive help. This is a forum policy, and we are not a free "we will do your homework" service.
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Offline Hunter2

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A sample of 1.5g of Copper (I) oxide and copper (II) oxide is heated in hydrogen gas to give 1.298g of pure copper metal. Calculate the percent composition by mass of the two copper compounds in the sample.

You have to develop two equations.  You get information of the mass difference about oxygen. You can calculate the molecular weight of the mixture. You know the mole of copper and oxygen obtained.

Offline roneddy

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x=mass of CuO
y=mass of Cu2O

x+y=1.5 [1]
0.18=(x) (16/79.54) + (y) ( 16/143.08)

is this correct?

Offline Borek

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0.18=(x) (16/79.54) + (y) ( 16/143.08)

Please explain what these numbers are. Molar masses of copper oxides are obvious, but what are the others? Especially, what is the 0.18 on the left?
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