For problems 9-11, consider a fire that has been put out using a solid sodium ch
ID: 542065 • Letter: F
Question
For problems 9-11, consider a fire that has been put out using a solid sodium chloride extinguisher. v9. The molar heat capacity of sodium chloride is 2.91 kJ/mol-K. What is its specific heat capacity? A. 49.8 J/g-DC 10,--Upon being sprayed on the fire, the B. 0.853 J/g-OC C. 14.5 kJ/g C D. 20.3 J/g Dc sodium chloride was heated from 25.1 DC to 59.3 DC. If 500.0 g sodium hloride was added, how much heat was absorbed? Assume all heat lost by the fire is absorbed by the sodium chloride. B. 2.37 x 10'J C. 8.52 x 10 D. 91.3 A. 1.46 x 10'JExplanation / Answer
9)
specific heat capacity of NaCl = (molar heat capicity of NaCl)/(molar mass of NaCl)
molar mass of NaCl = 58.5 g/mol
so,
specific heat capacity of NaCl = (2.91/58.5) KJ/g.oC
= 0.0498 KJ/g.oC
= 49.8 J/g.oC
Answer : option A
10)
use,
heat absorbed = m*s*(T2-T1)
= (500*49.8*(59.3-25.1)) J
= (500*49.8*34.2) J
= (8.52*10^5) J
Answer : option C
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