Question

calculate the amount of heat required for 10 g of ice to raise the temp from -4°C to +4°C​

Answer 1

Answer:

Explanation:

Specific heat is the amount of heat required to raise the temperature of one gram of a substance one degree celsius. The equation for calculating the amount of heat required for a given temperature change in a given mass of substance is:

q = mc Delta T  where:

q = heat  

m = mass = 186g

c = specific heat = 4.186 Joules/gram-ºC

Delta T = change in temperaturge = 69ºC-29ºC = 4ºC

q = (186 g)(4.186 J/g-ºC)(40ºC) = 31,099 J = 31,000 J rounded to 2 significant digits.

To change this value to kilojoules, multiply by the conversion factor 1kJ/1000 J:

(31,000 J)(1 kJ/1000 J) = 31 kJ

Another method of calculating the answer is kJ is to change the specific heat of water to kJ/g-ºC:

(4.186 J/g-ºC)(1 kJ/1000 J) = .004186 kJ/g-ºC