say u have 5ml 50% ethanol and in a solution its 1.000ml mineral water and 0.500 ethanol plus 0.5ml yeast how the hell do u do it i know u need to find density of ethanol
say u have 5ml 50% ethanol and in a solution its 1.000ml mineral water and 0.500 ethanol plus 0.5ml yeast how the hell do u do it i know u need to find density of ethanol
moles = mass/molar mass or moles = concentration x volume (in dm3) Google says density = mass/volume (remember Google is your friend.)
I presume volume would be 2.5ml because it's 50% of 5ml. As you divide 1cm by 1000 to get dm3, I guess to get dm3 for ml I'd have to divide by 100. So moles = concentration x volume (in dm3), so moles = 0.500mol dm-3 x 0.0025dm-3 = 0.00125 moles.
Rearranging the moles = mass/molar mass equation gives us mass = moles x molar mass Ethanol is C2H6O mass = 0.00125 x (24 + 6 + 16) mass = 0.0575g
So density = mass/volume (in cm3) So density = 0.0575g / 0.25cm3
moles = mass/molar mass or moles = concentration x volume (in dm3) Google says density = mass/volume (remember Google is your friend.)
I presume volume would be 2.5ml because it's 50% of 5ml. As you divide 1cm by 1000 to get dm3, I guess to get dm3 for ml I'd have to divide by 100. So moles = concentration x volume (in dm3), so moles = 0.500mol dm-3 x 0.0025dm-3 = 0.00125 moles.
Rearranging the moles = mass/molar mass equation gives us mass = moles x molar mass Ethanol is C2H6O mass = 0.00125 x (24 + 6 + 16) mass = 0.0575g
So density = mass/volume (in cm3) So density = 0.0575g / 0.25cm3
Spoiler
mate i cant get standard deviation if i didnt do repeat tests of the experiment right?
mate i cant get standard deviation if i didnt do repeat tests of the experiment right?
I'm pretty sure you can, as standard deviation just shows the variation in data about the mean (I think.) You can get a mean from just one set of data.
I'm pretty sure you can, as standard deviation just shows the variation in data about the mean (I think.) You can get a mean from just one set of data.
ur kidding me. how the hell do i add error bars onto it then
moles = mass/molar mass or moles = concentration x volume (in dm3) Google says density = mass/volume (remember Google is your friend.)
I presume volume would be 2.5ml because it's 50% of 5ml. As you divide 1cm by 1000 to get dm3, I guess to get dm3 for ml I'd have to divide by 100. So moles = concentration x volume (in dm3), so moles = 0.500mol dm-3 x 0.0025dm-3 = 0.00125 moles.
Rearranging the moles = mass/molar mass equation gives us mass = moles x molar mass Ethanol is C2H6O mass = 0.00125 x (24 + 6 + 16) mass = 0.0575g
So density = mass/volume (in cm3) So density = 0.0575g / 0.25cm3
The mean of both is 50, yet in the first example, the standard deviation is much larger because the values used to calculate the mean are spread out much further.
That is my understanding of it, though there's always the possibility that I'm wrong, so get someone else to confer with.
The mean of both is 50, yet in the first example, the standard deviation is much larger because the values used to calculate the mean are spread out much further.
That is my understanding of it, though there's always the possibility that I'm wrong, so get someone else to confer with.
yes i understand that but in your example you have repeats e.g 10,30,50 ETC what if i literally just have one number??
so at time 0 i get 20 yeast cells, at time 30 i get 40 yeast cells, how can i do a standard deviation if i dont have repeats for an average??
yes i understand that but in your example you have repeats e.g 10,30,50 ETC what if i literally just have one number??
so at time 0 i get 20 yeast cells, at time 30 i get 40 yeast cells, how can i do a standard deviation if i dont have repeats for an average??
They're not repeats of a test, they're just values in the data for one test. But I think I get where you're coming from. I suppose then I'd be no variation about the mean, so SD low/non-existant. I don't see where that'd happen though. I'm not sure here.
Is it possible for you to post the entire question? Edit: Perhaps you can't do a standard deviation here. I'm really not sure here, so I might very well be wrong with the answer in this post.
They're not repeats of a test, they're just values in the data for one test. But I think I get where you're coming from. I suppose then I'd be no variation about the mean, so SD low/non-existant. I don't see where that'd happen though. I'm not sure here.
Is it possible for you to post the entire question? Edit: Perhaps you can't do a standard deviation here. I'm really not sure here, so I might very well be wrong with the answer in this post.
sir, say i have 0.550ml ethanol and 0.950 water ALSO have 0.5 ml YEAST and i want the molarity, how does the yeast affect the calculation?