need help on #8 show work and why ? please prebiem. Report the amount heal nuede

Question

need help on #8 show work and why ? please

prebiem. Report the amount heal nueded to The tempetonre find the heat by 200 groms of wel 40oc to tormice 200c ow much heat energy is needed o use le mpeolu 0 oact form sleom at 1200 8 Colcuate the amount of heat by 12oogoms of seam ot 50 to am Determine ene ormaunt of heat that must be removed tom 200D gom d team 000 C o. How much heat required to rise the tempe ature of 30 g ot Hac en Booc to 150 Don't forget the phose chengen he folowing constants: MP, 25 C, BP, -80 C, Hi xylene has 020 C. How off when 40D gomu e ene temperature dropped from 100.0 C, to 000 ca 2. the informason above for what would the snai lemperat be xylene. 150R calories were added to 200 g sompia orignolv oh a 230 colories are added to 92 g of is the spectic heal of igud 247oC to -182°C, without a phase change. What 0.20 J/g c

Explanation / Answer

mass of steam = 120 gm, moles = mass/molar mass = 120/18= 6.67

Initial temperature = 150 deg.c

1. First the steam has to be cooled from 150 deg.c to 100 deg.c, this is sensible heat= mass* specific heat* temperature difference

Specific heat of steam = 2.108 J/gm.deg.c

hence heat to be removed = 120*1.996*(150-100)= 11976 Joules=11.976 KJ

2. Heat need to be removed in the form of latent heat to convert steam at 100 deg.c to liquid at 100 deg.c, This heat is = moles* latent heat of vaporization of steam ( in J/mole)=6.67*40.8 Kj/mole =272 Kj

3. at 100 deg,c liquid need to receive sensible heat up to 0 deg.c , this is = 120*4.184* 100 = 50208 Kj= 50.208 Kj

4. at 0 deg,.c, one needs to supply heat of fusion, this heat is = 120 gm*334 J/gm= 40080 Joules= 40.080Kj

5. from 0 deg,c to -15 deg.c, it is sensible heat and this is =120*2.108*15= 3794 J= 3.794 Kj

total heat to be removed = sum of heats remove from 1 to 5= 11.976+272+50.208+40.080+3.794=378 Kj

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.