hi,

i am stuck on question 15B part 3, the calculation. I am not really sure how to go about this?

**0**

# 2005 - Written Paper - 15(b)(iii)

Started by sarmad, May 27 2006 04:35 PM

3 replies to this topic

### #1

Posted 27 May 2006 - 04:35 PM

### #2

Posted 27 May 2006 - 04:44 PM

hi,

i am stuck on question 15B part 3, the calculation. I am not really sure how to go about this?

Ok the part of the equation we're dealing with is:

C6H8O6 + I2

Information stated about iodine: 21.4cm

0.005 mol/l (as stated previously in the question)

Now you can work out the number of moles of iodine by using: number of moles = conc. * vol

and as the ratio of the reactants is 1:1, the orange juice will have the same number of moles. Now you can work out the mass of the orange juice in 50cm , then multiply it by 10 to find the mass of 500cm

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### #3

Posted 27 May 2006 - 06:28 PM

hi,

i am stuck on question 15B part 3, the calculation. I am not really sure how to go about this?

Ok the part of the equation we're dealing with is:

C6H8O6 + I2

Information stated about iodine: 21.4cm

0.005 mol/l (as stated previously in the question)

Now you can work out the number of moles of iodine by using: number of moles = conc. * vol

and as the ratio of the reactants is 1:1, the orange juice will have the same number of moles. Now you can work out the mass of the orange juice in 50cm , then multiply it by 10 to find the mass of 500cm

sorry, but i still dont seem to be getting the correct answer?!?

### #4

Posted 27 May 2006 - 06:40 PM

hi,

i am stuck on question 15B part 3, the calculation. I am not really sure how to go about this?

Ok the part of the equation we're dealing with is:

C6H8O6 + I2

Information stated about iodine: 21.4cm

0.005 mol/l (as stated previously in the question)

Now you can work out the number of moles of iodine by using: number of moles = conc. * vol

and as the ratio of the reactants is 1:1, the orange juice will have the same number of moles. Now you can work out the mass of the orange juice in 50cm , then multiply it by 10 to find the mass of 500cm

sorry, but i still dont seem to be getting the correct answer?!?

its kl i get it now, wrong adding first time round

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