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    (Original post by FREYA2898)
    NEED HELP WITH THIS:
    2.4) What is the maximum mass of iron (III) chloride that can be produced from 50.0 g of Fe and 100gof chlorine gas ?2 Fe + 3 Cl2 → 2 FeCl3
    Well if you look at the mole ratios
    what similarity will you see between Fe and FeCl3

    I'll ask you a similar question
    So I've got 1/2 a bag of flour 1 carton of milk and 9eggs
    To make a cake, I need 1/2 a bag of flour, 1 carton of milk, and 2 eggs
    How many cakes can I make with my ingredients? hope that helps
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    :eek3: 82 hours until OCR A Unit 1... :eek3:
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    Thank you so much!!

    just wondering, are you a genius?
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    hi who here does edexcel for As chemistry>?
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    hi does anyone know how to answer these two questions...
    Induim has two peaks m/z-113 and m/z-115 and relative atomic mass of this sample is 114.5
    calculate the ratio of the relative abundances of the two isotopes and the answer is 1:3 but I don't know how they got to the answer

    and another completely different question is..
    the relative formula mass is 138.2 of M2CO3
    determine the relative atomic mass and deduce the identity of M and the answer is K and 39.1 but I don't know how they got to the answer
    please help me btw this is an aqa as chemistry questions thanks in advance
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    Hi, anyone doing OCR Chemistry do we need to know about the models of the atom that changed overtime? Thanks
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    (Original post by Shadowfire123)
    hi who here does edexcel for As chemistry>?
    me
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    Also does anyone have access to the OCR F321 June 2014 mark scheme? I've got the paper but don't have the mark scheme and I've just realised they haven't been realised yet
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    (Original post by hannah4262)
    Hi, anyone doing OCR Chemistry do we need to know about the models of the atom that changed overtime? Thanks
    Salters?
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    (Original post by Nidfeo)
    Salters?
    No F321?
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    (Original post by cilla_e)
    Thank you so much!!

    just wondering, are you a genius?
    Np
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    (Original post by Rstlss)
    me
    haha good hows revision going for you then
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    How do you work out how many structural isomers an organic compound has? Do you just have to draw it in as many ways as you can? A question asked how many structural isomers does the alkane C5H12 have.
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    (Original post by Shadowfire123)
    haha good hows revision going for you then
    Not too good, I'd really like an A, but tbh I'd be lucky with a B
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    I do edexcel too homies. They're making the papers really hard now

    Posted from TSR Mobile
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    In the production of sulphuric acid sulphur dioxide is converted to sulphur trioxide byreaction with the oxygen in the air. What volume of air (assume 20% of the air is oxygen)would be needed to produce 150 cm3 of sulphur trioxide? Assume complete conversion ofsulphur dioxide to sulphur trioxide.
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    In the production of sulphuric acid sulphur dioxide is converted to sulphur trioxide by reaction with the oxygen in the air. What volume of air (assume 20% of the air is oxygen) would be needed to produce 150 cm3 of sulphur trioxide? Assume complete conversion of sulphur dioxide to sulphur trioxide.
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    Hi, anyone that does AQA, do you know if we should revise the atomic models? I've not seen any questions in the past years..
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    Someone show me how to do this please, thanks
    (sorry about the bad pic)
    Posted from TSR Mobile
    Attached Images
     
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    (Original post by TeaAndTextbooks)
    Someone show me how to do this please, thanks
    (sorry about the bad pic)
    Posted from TSR Mobile
    Draw a Hess cycle
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