How many kilocalories are required to increase the temperature of 15.6 g of iron from 122 °c to 355 °c. the specific heat of iron is 0.450 j/g °c?

Heat require to boil 15.6 g iron from 122 C0to 355 C0 whereas,

Where, m is mass of iron

s is specific heat of iron

d T is change in temperature in celcius

If  

1 cal = 4.2 J

Then,  

Thus 0.389 k cal of enrgy  is required by a 15.6 g Fe to reach to 355 C^0

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.