Which arrow on the phase diagram best corresponds to a substance being heated be

Question

Which arrow on the phase diagram best corresponds to a substance being heated between C and D on the heating curve? Rank the three substances in order from lowest boiling point to highest boiling point: CCl4, CFs, CH (A) CH CFCCL (B) CHCClL CF 1. 4. 5. A solution is prepared by Molar mass/g mot 17.03 dissolving 15.0 g of NHs in 250.0 g of water. What is the molality of the NH, in the solution? emperature (B) 3.52 m (D) 0.00353 (A) 60.0 m (C) 3.24 m 6. What is the molal concentrationMolar mass/gmot when 0.10 moles of LiCl are LiCI dissolved in 10.50 moles of water? 42.39 18.02 H2O (A) IV (B) 111 (C) (D) 1 (A) 5.3x 10-1m (C) 4.0x104 (B) 9.5×10-m (D) 5.3x10-4 m The molar heat of vaporization of bromine at 25 C is +15.0 kJ-mol. How much heat (in kJ) would be required to vaporize 25.0 g of bromine, Br2? (A) 1.67 kJ (C) 95.9 kJ 2. | Molar mass i g.mor1 Br 159.81 7. | Molar mass/ g-mol what is the molar concentration ofa 12.0% by mass sodium Naico, 105.991 carbonate, Na COs, aqueous solution having a density of 1.124 gmL-1? (B) 2.35 k (D) 375 kJ (A) 1.01 MM (C) 1.27 M (B) 1.13 M (D) 144 M 3. Which pure substance is capable of forming hydrogen bonds? How are the boiling point and freezing point of a pure liquid affected by the addition of a solute? 8. (A) The boiling point and freezing point of the solution are both increased relative to the pure liquid. The boiling point and freezing point of the solution are both decreased relative to the pure liquid The boiling point of the solution is decreased and the freezing point is increased relative to the pure liquid. (B) (C) C-H The boiling point of the solution is increased and the freezing point is decreased relative to the pure liquid. (D)

Explanation / Answer

1)

Between C and D, phase is liquid

There is no phase change taking place

same is shown by arrow II

Answer: C

2)

Molar mass of Br2 = 159.81 g/mol

mass of Br2 = 25.0 g

we have below equation to be used:

number of mol of Br2,

n = mass of Br2/molar mass of Br2

=(25.0 g)/(159.81 g/mol)

= 0.1564 mol

Q = number of mol * Hvap

= 0.1564 mol * 15.0 kJ/mol

= 2.35 KJ

Answer: B

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