500g of water is heated so that its temperature rises from 30°C to 72°C in 7 minutes. calculate the supplied per minute. (Specific heat capacity of water is 4200J\(kg^{-1}K^{-1}\)

Zionjohn

4 years ago

Let's be candid to ourselves, we're asked to cal. heat supplied per minutes; this must have meant alotvlike Power but sincectye units given in the various options are JOULES, so we are to find Energy and not Power

From the calorimetric formula:
Energy= MC∆
where m= mass, C= specific heat capacity and ∆ = temperature change
Therefore, E = (500/1000) * 4200 * (72-30)
Energy = 88200 Joules

esmagico

11 years ago

The mins have to be converted to seconds na

bobleetk

11 years ago

that is 500kg not 500g

miss PJ

9 years ago

it was kg-1k-1 but d degree Celsius(*c) was nt converted 2 Kelvin k. is dat ok?