Q.

At 25oC, the density of 15 M H2SO4 is 1.8 g cm-3. Thus, mass percentage of H2SO4 in aqueous solution is

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81.6%

18%

1.8%

answer is B.

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Detailed Solution

15 M H2SO4 means 15 mol L-11000 mL of H2SO4 slution has H2SO4=15mol=15×98gAlso, 1000 mL=1000×1.8gH2SO4 solutionThus, (1000×1.8)g H2SO4solution has H2SO4=15×98g100 g H2SO4 solution has H2SO4=15×98×1001000×1.8=14701800×100=81.6%Thus, mass percentage of H2SO4=81.6% ORM = %×d ×10GMW % = M ×GMW d×10 % = 15× 981.8×10 % = 81.66

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