Answer to Question #180746 in Physical Chemistry for You

Question

Consider a flat sheet of iron at 300 K does not receive any radiation from its surroundings. The metal is 10 cm x 10 cm x 0.1 cm; the heat capacity is 25 J/K mol; the density is 7.86 g/cm3

a) How many joules per second are lost by radiation initially? Assume that one flat side only radiates into space.

Answer: 4.59 Watts

b) After 20 minutes, what is the temperature of the metal plate?

Answer: 219Kelvin

SHOW SOLUTION!

Answer 1

a) Using the formula M=D×V, we calculate the mass of the sheet then later we apply $Q=mc\Delta T$ to get 4.59W

b)Calculate the temperature difference within 20 minutes.