Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    Copper oxide is reduced by excess hydrogen. Calculate the maximum mass of copper that could be obtained from 79.5 g of copper oxide.CuO H2 → Cu H2Ohow do u work this out????
    Offline

    12
    ReputationRep:
    You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.

    1) work out the moles of CuO.
    - mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO

    2) work out mol Cu
    - from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol

    3) work out mass of Cu
    - mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu
    Posted on the TSR App. Download from Apple or Google Play
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.