Question

Which of the following forms a molecular solid? palladium ° C, graphite QUESTION 5 Calculate the freezing point of a solution of 30.0 g methyl salicylate, C7H602, dissolved in 800. g of benzene, C6H6. Kf for benzene is 5.10°C/m and the freezing point is 5.50°C for benzene 0 1.56°C O -1.56°C 3.93°C O 7.06 C QUESTION 6 How many grams of H2 gas are there in a 5.00-L cylinder at 4.00 2.16 9 O 0.542 g O 823 g O 1.08 g x 10 mm Hg and 23°C? QUESTION 7 A supercritical fluid refers to a substance O above both its critical temperature and its critical pressure at its triple point. that is in the liquid crystal state o with a viscosity of zero

Answer 1

1) C, grapfhite is a molecular solid as well as covalent solid

2) Freezing point of solution:

T_F = K_FM

C, graphite is a molecular solid as well as covalent solid 2) Freezing point of solution: Delta T_F = K_F M No. of moles of methyl salicylate = wt taken/mol wt = 30/122 = 0.246 Molality = No. of moles/wt of solvent in kg = 0.246/0.8 = 0.307 Delta T_F = 0.307 x 5.10 = 1.568 = T_f solvent - T_f solution -T_f solution = Delta T_F - T_f solvent = 1.568-5.50 = -3.93 C T_f solution = 3.93 C 3) PV = nRT 4000 mm of Hg = 5.26 atm T = 23 + 273 = 296 K 5X5.26 = nX 0.0820 x 296 n = 26.3/24.30 = 1.082 = wt taken/mol wt 0.924x2 = mass of hydrogen = 2.16 gms 4) A supercritical fluid refers to a substance above both its critica temperature and critical pressure.

No. of moles of methyl salicylate = wt taken/mol wt = 30/122= 0.246

Molality = No. of moles /wt of solvent in kg = 0.246/0.8 = 0.307

T_F = 0.307 x 5.10 =1.568 = T_f solvent - T_fsolution

C, graphite is a molecular solid as well as covalent solid 2) Freezing point of solution: Delta T_F = K_F M No. of moles of methyl salicylate = wt taken/mol wt = 30/122 = 0.246 Molality = No. of moles/wt of solvent in kg = 0.246/0.8 = 0.307 Delta T_F = 0.307 x 5.10 = 1.568 = T_f solvent - T_f solution -T_f solution = Delta T_F - T_f solvent = 1.568-5.50 = -3.93 C T_f solution = 3.93 C 3) PV = nRT 4000 mm of Hg = 5.26 atm T = 23 + 273 = 296 K 5X5.26 = nX 0.0820 x 296 n = 26.3/24.30 = 1.082 = wt taken/mol wt 0.924x2 = mass of hydrogen = 2.16 gms 4) A supercritical fluid refers to a substance above both its critica temperature and critical pressure.

-T_fsolution = T_F - T_f solvent = 1.568-5.50 = -3.93 C

C, graphite is a molecular solid as well as covalent solid 2) Freezing point of solution: Delta T_F = K_F M No. of moles of methyl salicylate = wt taken/mol wt = 30/122 = 0.246 Molality = No. of moles/wt of solvent in kg = 0.246/0.8 = 0.307 Delta T_F = 0.307 x 5.10 = 1.568 = T_f solvent - T_f solution -T_f solution = Delta T_F - T_f solvent = 1.568-5.50 = -3.93 C T_f solution = 3.93 C 3) PV = nRT 4000 mm of Hg = 5.26 atm T = 23 + 273 = 296 K 5X5.26 = nX 0.0820 x 296 n = 26.3/24.30 = 1.082 = wt taken/mol wt 0.924x2 = mass of hydrogen = 2.16 gms 4) A supercritical fluid refers to a substance above both its critica temperature and critical pressure.

T_fsolution = 3.93 C

3) PV = nRT 4000 mm of Hg = 5.26 atm T = 23+273 = 296 K

5X5.26 = nX 0.0820x 296

n = 26.3/24.30 = 1.082 = wt taken/mol wt

0.924x2= mass of hydrogen = 2.16 gms

4) A supercritical fluid refers to a substance above both its critica temperature and critical pressure.