4. When 732 grams of water was heated, it absorbed 1962 Joules of heat. The original temperature of the water was 45°C. What was the final temperature?

=final temperature

Explanation:

In the question specific heat of water is not given but we should know the value of that and it 4.18Jg∘C

Specific heat means how much heat is required to increase the temperature of 1 gram of substance that substance by 1∘C .

Equation between heat lost or gain and the change in temperature.

q=m⋅c⋅ΔT , where

q - the amount of heat

m - the mass of the sample

c - specific heat  of sample

ΔT - change in temperature

put all the given value into this ,

=final temperature.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.