How much heat is contained in 100 kg of water at 60.0 °C? (Hint: A substance at absolute zero, -273o C, has 0 heat content.) Be mindful of significant figure rules for both multiplication and addition.

2.10 x 10^4 kcal
2.40 x 10^4 kcal
30 kcal
2.77 x 10 4^kcal

Please provide an explanation

30 kcal 2.10 x 104 kcal 2.40 x 104 kcal 2.77

Explanation:

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.