OpenStudy (anonymous):

PLEASE HELP! I am trying to work out k in a the rate equation, rate=k[h202]^1[5% yeast catalyst]^1 in order to later determine the activation enthalpy but do not know what the concentration of the 5% yeast solution is in terms of mol/dm^-3. Does anyone know how I would do this? Thanks

2 years ago
OpenStudy (jfraser):

it's probably 5% mass/volume, so every 100g of water contains 5g of yeast

2 years ago
OpenStudy (anonymous):

So would that mean it would be 5mol/dm3?

2 years ago
OpenStudy (jfraser):

definitely not

2 years ago
OpenStudy (jfraser):

is the starting concentration of yeast changed during the experiment, or just the peroxide?

2 years ago
OpenStudy (jfraser):

you may not actually need the concentration of yeast, but without more info I'm not sure

2 years ago
OpenStudy (anonymous):

but if it is first order with respect to yeast I would need to know the concentration of yeast

2 years ago
OpenStudy (jfraser):

then you would need to convert 5g of yeast into moles of yeast. You need to know the formula of the yeast to find its molar mass, and I'm not sure that yeast has a definite formula.

2 years ago
OpenStudy (anonymous):

okay thank you I will try and find a formula for it

2 years ago