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  1. Thisansa

    Chemistry: Post your doubts here!

    For question 4: The equation we must use is pV=nRT, rearrange the equation to get p=nRT/V since n and R are constant you can consider that pressure is directly proportional to T and is inversely proportional to V so you can build up 2 equations p1/p2 = T1/T2 and p1/p2 = V2/V1 we can combine...
  2. Thisansa

    Chemistry: Post your doubts here!

    For question number 3: First you have to find the Mr of the whole molecule= 207.2+ 4[(12*2)+(1*5)] = 323.2 Then you gotta find the total mass of carbon= 4(12*2)= 96 Then to find the percentage of Carbon in the molecule you have to divide the total mass of C by the total mass of the molecule and...
  3. Thisansa

    CHEMISTRY PAPER 34 On 31st MAY

    Thank you guys! Good luck for the exam!
  4. Thisansa

    CHEMISTRY PAPER 34 On 31st MAY

    Please tell us:cry::cry::cry:
  5. Thisansa

    Sharing my CIE A2 Paper 4 Biology Topical Past Years 2002-2015 Summer and Winter

    This is the best! Thank you so much!
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