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    Physics, Chemistry and Biology: Post your doubts here!

    Alright then so you know the moles formula: # of moles = mass/molar mass so you got 1.398/233 which is 0.006 now the same number of moles are used for the MgSo4 which is hydrates, as given in the equation, so 0.006 for that too the mass of one mole is basically the molar mass. you rearrange the...
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    Physics, Chemistry and Biology: Post your doubts here!

    use the moles concentration formula. # of moles= (concentration/1000)*volume so. 0.2/1000*100 so you would get 0.02 as the number of moles. then you use the other moles formula: # of moles = mass/molar mass so 0.02= x/170 so x = 170*0.02 which is, 3.4
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    Physics, Chemistry and Biology: Post your doubts here!

    200cm3 of oxygen, which is in excess. After the reaction, 40cm3 of oxygen remains. SO the total amount of oxygen used would be 160cm3. 100cm3 of CO2 would be used, as it is given,and 20cm3 of hydrocarbon. Rearrange this set up: 20cm3 of hydrocarbon + 160cm3 of oxygen ---> 100cm3 of CO2 + xcm3 of...
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    Maths 0580 Paper 4 Post-Discussion

    Y Yeah dude I know that, but there was more than 1 answer. Like for the k with 3 solutions, you had both 8 and 9 and the values, and the one with one solution had a huge range, both positive and negative.
  5. S

    Maths 0580 Paper 4 Post-Discussion

    I got 1/36, then 1/12, then 7 (because it has 1/6th probability), and 47/432 or something.
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    Maths 0580 Paper 4 Post-Discussion

    hey guys, I have a question pertaining to that paper. For the graph question, where we had to find integer values for the answers, where k had one solution and 3 solutions, there were multiple answers you could get; so I didn't know whether to select only one out of the whole thing, or to put...
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    Physics, Chemistry and Biology: Post your doubts here!

    Hey guys, I have a question for the science exams: Suppose we write an answer, but it isn't in the marking scheme, but it isn't wrong either. Would the examiners go strictly by the marking scheme or use their fair judgement as well?
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