9. How much heat is required to raise the temperature of 200.0 g of Fe0, from 5.

Question

9. How much heat is required to raise the temperature of 200.0 g of Fe0, from 5.0 C to 25.0 °C? The specific heat of FeOs is 0.634 Jg°C a. 1200J b. 2500 J c. 90 d. 600J e. 1.3 J 10. Determine the final temperature of a gold nugget (mass 376 g) that starts at 66 C and loses 4.85 kJ of heat to a snowbank when it is lost. The specific heat capacity of gold is 0.128 J/g C. a. -35°C b.-990 c. 15°C d. 99°C e. 45 C 11. An endothermic reaction has a, a negative 11, absorbs heat from the surroundings, and feels cold to the touch. b. a positive AH, gives off heat to the surroundings, and feels warm to the touch. c. a negative AH, gives off heat to the surroundings, and feels warm to the touch. d a positive H, absorbs heat from the surroundings, and feels cold to the touch. e. a positive absorbs heat from the surroundings, and feels warm to the touch. 12. Use the standard reaction enthalpies given below to determine AHrxn for the following reaction P4(g) + 10c.ag) 4 PCI5(s) Given: rrxn_ ? AH rxn 157 kJ a. -1835 kJ b. -1364 kJ c. -1050. kJ d. -1786 kJ e. -2100. k

Explanation / Answer

9) since Q=m×c×T

   Where m = mass of the substance

   c= specific heat capacity of the material

   T = change in temperature

So, Q = 200 g *( 0.634 j / g °C) * (25-5) °C

= 2536 J

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