(a) and (b) are concerning two samples different gases, gas Kr and gas F_2 that

Question

(a) and (b) are concerning two samples different gases, gas Kr and gas F_2 that are at the same temperature and pressure in containers of equal volume. (a) Which gas has a higher rate of effusion? _____ Why? (b) Which container will have the gas of higher density? _____ Why? (c) Which light has the higher energy red visible light 650 nm or light with a frequency of 2.00 times 10^+18 (10^9 nm = 1 m) (d) The heat capacity of lead is 0.128 J/(g degree C) and the heat capacity of aluminum is 0.903 J/(g degree C). If the same amount of heat is added to 100, 0 g blocks of these two metals, which will have the higher final temperature?

Explanation / Answer

Q1.

a)

MW of Kr = 83.798 g/mol

MW of F2 = 37.99g/mol

note that F2 is light and Kr is heavier, so

effussion depends on mass

F2 >> Kr

the rate of effusion of F2 will be higher

b)

higher density = mass per unit volume

same amount of moles per unit

so

heavier mass -> Kr

therefore, higher density

c)

change WL to frequency

WL1 = 650 nm

WL = c/v

WL = (3*10^8)/(2*10^18) = 1.5*10^-10 m = (1.5*10^-10)(10^9) = 0.15 nm

higher energy is for those with smaller Wavlenghts

so choose the Second option

d)

the higher Temperature is the one with LOWER heat capacity, since this is the definition of how much heat is required per unit mass to increase 1 °C

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