if the molarity is 1 M the the density of naoh is 1.25 find molality
Answers
Answer:
in this question 1M solution of NaNO
3
,
By definition if Molarity we know that it is the no. of moles present in per litre of solution. = 1M molar solution has 1 mole of NaNO
3
for 1000ml of solution.
Therefore, mass of solute is mass of 1 mole of NaNO
3
= 23+14+48 = 85 gm.
volume of solution = 1000 ml as per definition.
Now,Given that density is 1.25 g/cm3
Therefore, mass = 1.25×1000 (m = density X volume)
=> mass = 1250 gm (solution mass)
Mass of solvent = mass of solution - mass of solute
= 1250 - 85= 1165gm.
Molarity is the no. of mole of solute per kg of solvent
=> m =
1165
1
×1000 =
1165
1000
=0.85m
Explanation:
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