Stoichiometry

• rain-coat

  15 Oct 07, 10:40

  Anyone knows what is that? its in chem tys ans scheme pg A8. i only know what is mole ratio
  
• unclebutcher

  15 Oct 07, 10:47

  it simply means a moles of A reacts with b moles of B. thus number of moles of A reqd to react with b moels of B is a.
• Hocklez

  15 Oct 07, 10:56

  thought is the whole chpt about the reaction and the mole ratio.
  
  u asking for definition?
• rain-coat

  15 Oct 07, 11:09

  so its the same as mole ratio? is it a must to wrte that in O level of can just write mole ratio?
• unclebutcher

  15 Oct 07, 11:12

  Originally posted by rain-coat:

  so its the same as mole ratio? is it a must to wrte that in O level of can just write mole ratio?

  ?????????? in o level of??????
  
  yeah its mole ratio
  
  but o level u can say
  
  as 1 HCL (=+ one more -) 1NaOH
  
  thus by stoichiometry
  
  0.0500 mole of hcl reacts with 0.0500 mole of naoh
• Hocklez

  15 Oct 07, 11:12

  Originally posted by rain-coat:

  so its the same as mole ratio? is it a must to wrte that in O level of can just write mole ratio?

  it means a whole chpt about mole ration, redox reaction, writing of reaction equation... alot...
  
  unless u wan definition, i am not sure how to tell u also...
  
  http://en.wikipedia.org/wiki/Stoichiometry
• AndrewPKYap

  15 Oct 07, 11:18

  Originally posted by rain-coat:

  Anyone knows what is that? its in chem tys ans scheme pg A8. i only know what is mole ratio
  

  it is the method for calculating the amounts required for, for example, chemical reactions...
  
  so mole ratio is used in Stoichiometry and Stoichiometry uses atomic weights, molecular weights and so on...
  
  If the question is, what do you use to calculate the amounts required for chemical reactions, the answer is Stoichiometry
  
  and the answer to what is Stoichiometry is : the method of calculating the amounts required for chemical reactions using concepts like mole ratio, atomic weights and so on...
• rain-coat

  15 Oct 07, 11:27

  Pure chem.
  
  Can just say by comparing mole ratio, mass of *compound* found is 2g? or can write equations in the 2 or 3 lines given?
• wishboy

  15 Oct 07, 13:18

  i love this chapter...
  easiest to score
• unclebutcher

  15 Oct 07, 13:48

  Originally posted by rain-coat:

  Pure chem.
  
  Can just say by comparing mole ratio, mass of *compound* found is 2g? or can write equations in the 2 or 3 lines given?

  no. you have to compare thru number of moles, not mass.
  
  number of moles = mass/ mr
• Deadly

  16 Oct 07, 17:34

  Originally posted by wishboy:

  i love this chapter...
  easiest to score

  this is just maths + some common sense
• rain-coat

  16 Oct 07, 23:11

  Originally posted by unclebutcher:

  no. you have to compare thru number of moles, not mass.
  
  number of moles = mass/ mr

  Ok thanks!