in Education by
Calculate the mass of ascorbic acid ( Vitamin C,C6H8O6) to be dissolved in 75g of acetic acid to lower its melting poit by 1.5∘C.Kf=3.9Kkgmol-1 Select the correct answer from above options

1 Answer

0 votes
by
Correct Answer - 5.077g Mw2(C6H8O6)=12×6+1×8+6×16=72+87+96 =176gmol-1 Mw1(CHM3COOH)=60gmol-1 ΔTf=1.5∘Kf=3.9Kkgmol-1 W1(CHM3COOH)=75g,W2=? Applying the formula, ΔTf=Kf×m=Kf× W2×1000 Mw2×W1 1.5K=3.9Kkgmol-1× W2×1000 176gmol-1×75g ∴W2= 1.5×176gmol-1×75g 3.9×Kkgmol-1×1000 =5.0769≈5.077g

Related questions

0 votes
    Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CHM3CN) when 6.5g of C9H8O4 is dissolved in 450g of CHM3CN . Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    The conductivity of 0.00241M acetic acid is 7.896 10-5Scm-1 . Calculate its molar conductivity. If ∧ ∘ ... its dissociation constant ? Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Calculate the amound of benzoic acid (C6H5COOH) required for preparing 250mL of 0.15M solution in methanol. Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Calculate the mass percentage of benzene (C6H6) and carbon tetraCHMloride (CCl4) if 22g of benzene is ... carbon tetraCHMloride. Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 L of water sucjh that its osmotic pressure is 0.75 atm at 27∘C . Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Calculate the mass of a non-volatile solute ( molecular mass 40 ) which should be dissolved in 114g octane to ... pressure to 80% . Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    An antifreeze solution is prepared from 222.6g of ethylene glycol [C2H4(OH)2] and 200g of water. Calculate the ... of the solution? Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Ascorbic acid is a/an (a) strong inorganic acid (b) hormone (c) vitamin (d) enzyme Select ... Science,Science proposed by,electromagnetic theory engineering physics,Science nptel...
asked Nov 8, 2021 in Education by JackTerrance
0 votes
0 votes
    A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point of a 5% ... water is 273.15 K. Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    How muCHM electricity is required in coulomb for the oxidation of ltbr. a. 1molofH2O→O2 b . 1m∞l of FeO to Fe2O3 Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    The decomposition of A into product has value of k as 4.5 103s-1 at 10∘C and energy of activation of 60kJmol-1 . At ... be 1.5 104s-1? Select the correct answer from above options...
asked Jan 4, 2022 in Education by JackTerrance
0 votes
    The activation energy for the reaction : ltbr. 2Hl(g)→H2(g)+I2(g) is 209.5kJmol-1 at 581K . ... greater than activation energy ? Select the correct answer from above options...
asked Jan 4, 2022 in Education by JackTerrance
0 votes
    Concentrated nitric acid used in the laboratory work is 68% nitric acid by mass in aqueous solution. What should be ... 1.504gmL-1 ? Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
0 votes
    Calculate the (a) molality, (b) molartiy, and (c) mole fraction of KI if the density of 20%( mass / mass ) aqueous KI is 1.202gmL-1 . Select the correct answer from above options...
asked Jan 5, 2022 in Education by JackTerrance
...