Physics

posted by .

The melting point of a solid is 90.0 degrees C. What is the heat required to change 2.5 of this solid at 40.0 degrees C to a liquid? The specific heat of the solid is 390 J/kg (K) and its heat of fusion is 4000 J/kg.

A. 4.9 10^4 J
B. 1.0 10^4 J
C. 5.9 10^4 J
D. 5.0 10^4 J

I am leaning towards C, but I need help understanding the process a bit more thoroughly. Thanks!

• Physics -

I assume that the amount to be melted is 2.5 kg. If you start out at the melting point (40 C), the energy reguired is 4000 J/kg x 2.5 kg = ?

• Physics -

Yes kg.

• Physics -

yes

Similar Questions

1. physics

lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature …
2. physics

The melting point of a solid is 90.0 d/C. What is the heat required to change 2.5 kg of this solid at 40.0 d/C to a liquid?
3. chemistry

the heat of fusion for thallium is 21 J/g, and its heat of vaporization is 795 J/g. Thallium's melting point is 304 degrees celsius, and its boiling point is 1457 degrees celsius. The specific heat of liquid thallium is 0.13 J/g degrees …
4. Chem II

Sulfur dioxide is produce din enormous amounts for sulfuric acid production. It melts at -73 degrees C and boils at -10 degrees C. Its heat of fusion is 8.619 kJ/mol and its heat of vaporation is 25.73 kJ/mol. The specific heat capacities …
5. Physics

How much heat is required to melt 50 g of mercury at -45 degrees celsius to 425 degrees celsius. (melting point=-38.degree-c, specific heat=0.03325 cal/g-degree c for solid mercury, .2988 cal/g-c degree c for liquid mercury and .2486 …
6. Physics

How much heat is required to melt 50 g of mercury at -45 degrees celsius to 425 degrees celsius. (melting point=-38.degree-c, specific heat=0.03325 cal/g-degree c for solid mercury, .2988 cal/g-c degree c for liquid mercury and .2486 …
7. Physics

How much heat is required to melt 50 g of mercury at -45 degrees celsius to 425 degrees celsius. (melting point=-38.degree-c, specific heat=0.03325 cal/g-degree c for solid mercury, .2988 cal/g-c degree c for liquid mercury and .2486 …
8. ap chemistry

How much heat is required to heat 19 g of solid silver from 100 ◦C to liquid silver at 961◦C?
9. science

Specific heat capacity of solid ethanol is 2.419 J/g C. Melting point temperature of ethanol is -114.4 C/ 158.8 K. Enthalpy of fusion of ethanol is 106.4 J/g. Specific heat capacity of liquid ethanol is 2.440 J/g C. 44.0 g of solid …
10. Physics

An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely …

More Similar Questions