1)A hot piece of zag (Ce(Ag)=0.23J/g C) of unknown mass at 500c is dropped on a
ID: 1058360 • Letter: 1
Question
1)A hot piece of zag (Ce(Ag)=0.23J/g C) of unknown mass at 500c is dropped on a cold 25C contained with 100g of water (Ce(H2O)=4.184J/gC ).Calculate the mass of the silver piece if the final temperature of the water +Ag piece is 45C. 2)Home smoke alarms are able to detect CO quantities as low as 0.01 ATM.How many grams of CO are in a 40000L room 25C if the CO pressure is 0.01 ATM? Name: Problem 1 A bo piece of Ag (CA) 0.23Mg cy of unknown mas at 500 "C is dropped on a cold 25 contained with 100g of water CAHtor4.18Aug CO. Calculate the mass of the silver piece if the final temperature of the water Ag piece is 45 c. Problem 3 Home smoke alarms are able to detect co quantities as Nowas001 atm. How many grams of co are in a 400 OL room 25 c ide Co pressure is 001 Problem 4Explanation / Answer
a) Qgain= mCpT ( heat is gained by water )
Q = 100 * 4.184 J / gm oC * (45 - 25)oC = 8368 J
Q lost= mCpT = m * 0.23 J/g o C * ( 25 - 500) o C ( heat is lost by the metal)
Qgain = Q lost = m * 0.23 J/g o C * ( 25 - 500) o C
- 8368 J = m * 0.23 J/g o C * ( 25 - 500) o C
m = 76.5946 gm
b) pco / Ptotal = Xco
0.01 atm / 1 atm = Xco = 0.01
KH = Pco C
KH is the Henry's constant of solubility of CO in air at 25oC , calculate the C, concentration (in M , mol/dm3)
[x gm / 28.01 gm/mol ] = C
find x which is your answer
The IR LED shoots a beam over a large area. If there is any smoke is present in the room,
it enters the optical chamber, having smoke particles scattered and sensor that raises the alarm.
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