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  1. N

    Paper 5 Tips !! :)

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w12_qp_52.pdf can you help me with 1(d)
  2. N

    Biology paper 2

    2 of H2S ~ 3 of O2 1 of H2S ~ 3/2 of O2 34.1 g of H2S ~3/2 * 32g of O2 34.1g of H2S ~ 48 g of O2 1g of H2S ~ 1.41 of O2 given, 8.65 g so, 8.65 of H2S ~ 1.41* 8.65g of O2 = 12.2g of O2 moles=...
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