1 ) If 30.0 kcal of heat are supplied to 5.00 102 g of water at 22° C, what is t

Question

1 ) If 30.0 kcal of heat are supplied to 5.00 102 g of water at 22° C, what is the final temperature of the water? unit in c

2 ) It is a damp, chilly day in a New England seacoast town suffering from a power failure. To warm up the cold, clammy sheets, Jen decides to fill hot water bottles to tuck between the sheets at the foot of the beds. If she wishes to heat 3.0 L of water on the wood stove from 20.0° C to 80.0° C, how much heat must flow into the water? unit in mj

3 ) A cylinder contains 280 L of hydrogen gas (H2) at 0.0° C and a pressure of 10.0 atm. How much energy is required to raise the temperature of this gas to 33.0° C?

Explanation / Answer

1 .

H = mc T ;

30 e 3   cal =   5 e 2 * 1 cal * ( T - 22 ) ;

T = 82 C ;

2 .

heat flow = m C T ;

H = ( V ) C T ;

H = ( 1 g / cm^3 * 3 * 1000 ) 4.18 ( 80 -20 )

H = 752400 J   = 0.7524 MJ    <----------ans

3 .

PV = nRT ;

n = PV / RT = 10 * 280 / ( 0.0821 * ( 0 + 273 ) ) = 124.925 moles ,

E = n R T ;

E = 124.925 * 8.314 * 33 = 34274 J

E = 34274 J <----------ans  

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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