What is the molality of an aqueous sucrose solution that is 250 sucrose C 12 H

What is the molality of an aqueous sucrose solution

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11. What is the molality of an aqueous sucrose solution that is 25.0% sucrose, C12H22O11by mass?SubstanceMolar MassC12H22O11342 g mol¯1(A) 0.585 m(B) 0.731 m(C) 0.975 m(D) 1.17 m12. A student finds that 31.26 mL of a 0.165 M solution of barium hydroxide, Ba(OH)2, solution is required to just neutralize 25.00 mL of a citric acid, H3C6H5O7, solution. What is the concentration of the H3C6H5O7solution?(A) 0.413 M(B) 0.309 M
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(C) 0.206 M(D) 0.138 M13. Which Group III element is expected to have physical and chemical properties that are the least similar to the other elements in that family?14. A pure gas that is 14.4% hydrogen and 85.6% carbon by mass has a density of 2.5 g L¯1at 0 °C and 1 atm presure. What is the molecular formula of the gas?15. The vapor pressure of most substances increase with temperature as depicted by this curve. Which wayof plotting these data is expected to give a straight line?16. If 0.10 mL of liquid water are introduced into a 1.0 L flask at 25 °C, how many moles of water are in the vapor phase when equilibrium is established?Vapor Pressure, 25 °CH2O23.8 mmHg(A) 1.28 x 10¯3(B) 5.56 x 10¯3(C) 1.53 x 10¯2(D) 4.46 x 10¯217. Sodium chloride, NaCl, usually crystallizes in a face-centered cubic lattice. How many Cl¯ ions are in contact with any single Na+ion?18. When solid NH4NO3is dissolved in water at 25 °C, the temperature of the solution decreases. What is true about the signs of H and S for this process?HS19. If the equilibrium constant for a reaction is very small (for example, 1 x 10¯20), what would the value of G be expected to be?20. Use the bond energies in the table to determine H for the formation of hydrazine, N2H4, from nitrogen and hydrogen according to this equation:N2(g) + 2 H2(g) ---> N2H4(g)Bond EnergiesN-N159 kJ mol¯1N=N418 kJ mol¯1N {triple bond} N941 kJ mol¯1H-H436 kJ mol¯1H-N389 kJ mol¯1(A) H = 711 kJ(B) H = - 98 kJ(C) H = + 98 kJ(D) H = + 711 kJ21. Use the given heats of formation to calculate the enthalpy change for this reaction:B2O3(s) + 3 COCl2(g) ---> 2 BCl3(g) + 3 CO2(g)Enthalpy of Formation Data, kJ mol¯1B2O3(s)- 1272.8COCl2(g)- 218.8BCl3(g)- 403.8CO2(g)- 393.5(A) 694.3 kJ(B) 354.9 kJ(C) -58.9 kJ(D) -3917.3 kJ
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