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10 years ago
How many grams of sodium chloride do you need to make 100ml of a .10M solution? I tried using the formula M= Mass/volume but it wasn't giving me any of the answers shown. I think I just guessed and put .1000 or something like that. Could you please help me figure it out.
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#1
10 years ago
100mL * 1L/1000mL * .10mol/L * 58.443grams/mol =.58443 grams (then round according to the number of significant figures...according to the way you presented this information, the rounded answer would be 6x10^-1 grams
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#2
10 years ago
First find moles NaCl needed.

Moles NaCl  =  Molarity of solution times the Volume in LITERS

so moles NaCl  =  .l0 M times  .1 liter   or   .01 moles

Now get moles into grams by knowing that moles times grams per mole = grams

so grams NaCl  =  .01 mole NaCl  times 58.5 g/mole   =   .585 grams
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#3
10 years ago
you're using the wrong formula, dude.
the right one is--
Molarity= (Given mass)/(Molar Mass) X 1/(Volume of solution)

Therefore,
0.10M=x/(58.4430 g/mol) * 1/(100 mL) * 10^3[since vol. of soln is in mL]
x=0.58443 g
wrote...
#4
10 years ago
M = moles/Liters

.1 = moles/.1

moles = .01

use the periodic table to get the molar mass of sodium chloride  (58.45grams/mole)

convert .01 moles to grams to get .5845
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