A) Tính nồng độ % của dd khi cho 20g KCl tan trong 600g dd b)Tính nồng độ mol của dd khi cho 160g dd CuSO4 tan trong 2 lít dd
c)Tính nồng độ phần trăm của dd thu được khi hòa tan hoàn toàn 12,4g Na2O trong 187,6g nước

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

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.