a million. you may desire to be conscious of the molecular weight beforehand you are able to answer this question... i think of it incredibly is 187 or around there. a million Mole = 187g/a thousand mls so then a million Mole = 18.7g/a hundred mls so then 5/18.7 = .267 Moles, and 267mM Do the comparable yet with the actual molecular weight of glucose it is going to around .277 Moles. you will want to calculate you'll be able to desire to commence with the molecular weight in grams/ a thousand mls of answer = it incredibly is a mole.. basically paintings it down from there...
Answers & Comments
Verified answer
molar mass Na2H2Y2 . H2O = 22.990*2 +1.008*2 + 88.906*2 +1.008*2+15.999 = 243.823
You have weighed out 3.156g, but this has 0.3% extra water. Dry mass of salt = 99.7/100*3.156 = 3.147g salt
mol of salt = 3.147/243.823 = 0.0129 mol dissolved in 1 litre
Molarity of solution = 0.013M
If 0.3% of the sample is moisture, then the other 99.7% of it is Na2H2Y2*H2O. How much is that?
99.7/100 x 3.156g = 3.146532g of actual chemical.
How many moles is that? Number of moles equals mass divided by molar mass.
n = m/M = 3.146352g / (243.84g/mol) = 0.012903346 moles.
(This step is mathematically dumb but I'll show it for completeness...)
The concentration is number of moles divided by volume, so
C = n/V = (0.012903346mol / 1L) = 0.012903346 mol/L.
Chop it down to two significant digits, if you're into that, and you get 0.013 mol/L or 13 mmol/L.
a million. you may desire to be conscious of the molecular weight beforehand you are able to answer this question... i think of it incredibly is 187 or around there. a million Mole = 187g/a thousand mls so then a million Mole = 18.7g/a hundred mls so then 5/18.7 = .267 Moles, and 267mM Do the comparable yet with the actual molecular weight of glucose it is going to around .277 Moles. you will want to calculate you'll be able to desire to commence with the molecular weight in grams/ a thousand mls of answer = it incredibly is a mole.. basically paintings it down from there...