A sample of 2.21 grams of Z is dissolved into 500 grams of water which is in a styrofoam
coffee cup. The temperature is monitored and
is found to drop from 23.512◦C to 23.269◦C.
What is ∆Hsolution for substance Z? Assume
no heat is lost/gained by the cup itself. The
specific heat of water is 4.184 J/g·
◦C and the
molecular weight of Z is 148 g/mol.
Answer in units of kJ/mol of Z.

b.

the accuracy of the data.

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.