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Home Q & A Board Biology-Related Homework Help Cell Biology
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oangi oangi
wrote...
12 years ago
What is the molar concentration of a saline solution make of 20g of NaCl in a total volume of 100ml?
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wrote...
#1
12 years ago
molar concentration = moles / Volume solution

molarity is defined as moles / L solution

moles = mass / mw
mw NaCl = 58.4 g/mole

moles = 20g x (1 mole / 58.4 g)  = 0.342 moles

so molarity = 0.342 moles / 100 ml x (1000 ml / L) = 3.42 molar
wrote...
#2
12 years ago
20 g NaCl x (1 mol NaCL / 58.443 g ) = 0.3422 mol NaCL
100ml x (1L / 1000 ml) = 0.1 L

M (molarity) = mol/L
M = 0.3422 mol/ 0.1 L
M = 3.422 M
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