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# Rate of reactions A2 OCR Chemistry help? watch

1. The question is given as a table so I've tried my best to make it clear here, apologies if it's not.

Initial [A]/mol dm-3 : 0.020, 0.040, 0.010, 0.060, 0.040
Initial [B]/mol dm-3: 0.020, 0.40, 0.040, 0.030
Initial rate mol dm-3 s-1: 1.2x10^-4, 9.6x10^-4, 2.4x10^-4, 8.1x10^-4, 7.2x10^-4

I managed to work out most of the values but the last value for the concentration of [B] is missing and i don't know how to work it out, can anyone help? I've also worked out that K is 15 and the missing answer is 0.035 but not sure how to arrive to this answer.
2. (Original post by AqsaMx)
The question is given as a table so I've tried my best to make it clear here, apologies if it's not.

Initial [A]/mol dm-3 : 0.020, 0.040, 0.010, 0.060, 0.040
Initial [B]/mol dm-3: 0.020, 0.40, 0.040, 0.030
Initial rate mol dm-3 s-1: 1.2x10^-4, 9.6x10^-4, 2.4x10^-4, 8.1x10^-4, 7.2x10^-4

I managed to work out most of the values but the last value for the concentration of [B] is missing and i don't know how to work it out, can anyone help? I've also worked out that K is 15 and the missing answer is 0.035 but not sure how to arrive to this answer.
Moving this to the chemistry section where you'll hopefully get some help

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