what molality of a resultant solution prepared by mixing 50 ml each of 2.5 molal and 3.5 molal H2 s o4
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Explanation:
in this question 1M solution of NaNO3,
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 NaNO3 for 1000ml of solution.
Therefore, mass of solute is mass of 1 mole of NaNO3 = 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 = 11651×1000 = 11651000
=0.85m
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