13. The mass of 3.75 mol of KF(s) is
a. 3.75 g
b. 58.1 g
c. 217.8 g
d. 108.9 g

C. 217.8 g

Explanation:

First, we find the weight of KF. notice they are 1:1 ratio. so the molar mass of K is 39.0983 and Fluorine is 18.998403

we add them together we get 58.09 g/mol

now to find the mass we do

* 3.175 mol

mol and mol cancel out, we left with 58.096 grams * 3.75

if you multiply you get 217.86 grams.

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.