the molality of 1L solution  with x% H2SOis 9. The weight of solvent present in the solution is 910g. the value of x is?   
a. 90
b. 80.3
c. 30.38
d. 46.87

Dear Student,

Molality =Number of molesMass of solvent ( in kg)or, Number of moles = Molality×Mass of solvent (in kg)                                     = 9×0.910                                      =8.19 molNow, Mass of H2SO4=Molar mass of H2SO4×Number of moles = 98×8.19 = 802.62 g% weight of H2SO4= x =Mass of H2SO4Mass of solution=Mass of H2SO4Mass of H2SO4+Mass solvent=0.8020.802+0.910=0.8021.712=46.87Hence, correct answer is (d)

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