# chemistry

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#1
what mass of hydrogen is needed to react with 40.0g of copper oxide
how do I do this questions I have no idea
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1 month ago
#2
can you write a balanced equation for the reaction of copper oxide with hydrogen?
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1 month ago
#3
(Original post by Lorena0990)
what mass of hydrogen is needed to react with 40.0g of copper oxide
how do I do this questions I have no idea
So hydrogen and copper oxide as educts react to the products copper and water?

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CuO + H2 -> Cu + H2O

Every copper atom has a mass of 63.5 g, every hydrogen 1 g and every oxygen 16 g. So Cu = 63.5 g, CuO = 79.5 g, H2 = 2 g and H2O = 18 g. You can solve it by the rule of three.<- use another colour to see masses were written in white!

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rule of three in this case means: divide the chemical balanced equation by 79.5 to get the mass for both educts and products and multiply all these by 40 as last step.
Last edited by Kallisto; 1 month ago
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