These three problems are from my homework im very lost, and if someone could ple
ID: 1308647 • Letter: T
Question
These three problems are from my homework im very lost, and if someone could please show me the way to do these answers it would be greatly appreciated.
1. Obtain the total heat energy, Qt, needed to convert 28.2 grams of ice at -43.1 celcius into steam at 158.0 celcius.
Qt=
2. A mass m=14g of nitrogen N2 is contained ina volume V=17.6E-3m^3 and under the pressure P=8.32E+4 Pa. Obtain the number of the moles, n, of the gas, the temp. T of the gas, and the rms velocity, Vrms, of N2 molecules in this gas.
n=
T=
Vrms=
3. A cylindrical copper rod has a radius r=1.32E-2m and a length L=0.642m. One end of the rod is at Th=240.0 Celcius and the other end at Tc=20.0 Celcius. Obtain the thermal power P transferred through the copper rod.
P=
Explanation / Answer
Heat Required=28.2[(2.1*43.1)+334+(4.2*100)+2260+(2*58)]
Heat Required= 9.079e4
n=14/28=0.5 moles
PV=nRT
8.32e4*17.6e-3=0.5*T*8.314
T=352.25K
Vrms for q2. - sqrt(3RT/M)
= sqrt(3*8.314*352.25/0.028)
=560.16 m/s
P=KA(T1-T2)/L = 397*pi*(1.32*10-2)2*(240-20)/0.642 = 74.5 W
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