Question

mole fraction of urea in 0.1M solution
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Answer 1

$\huge\bold\red{Answer:-}$

• Mole-fraction of Urea = 0.1
• So the Solution contains 0.1- moles of urea dissolved in 0.9- moles of water.
• MOLALITY (m) is defined as the number of moles of SOLUTE dissolved in 1000- g of SOLVENT.
• Here 1000- g of water = 1000/18= 55.55- moles of water.
• So number of moles of urea present in (1000- g ) 55.55- moles of water= 0.1/0.9 x 55.55 = 6.1728- m