# when 12.259g of a compound containning only copper and oxygen is descomposed it produced 2.410 of oxygen. how many grams of copper were in the compound?      Thank you.

Question
Asked Nov 30, 2019
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when 12.259g of a compound containning only copper and oxygen is descomposed it produced 2.410 of oxygen. how many grams of copper were in the compound?      Thank you.

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Step 1

According to law of conservation of mass, total mass of reactants and products in a chemical reaction is same.

In other words, in a chemical reaction, total mass of reactants is equal to total mass of products.

Step 2

As the compound contains only copper and oxygen, so, on decomposition, sum of mass of copper and that of oxygen formed will be equal to mass of compound decomposed.

Mass of compound decomposed = 12...

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