A scientist sets up a series of reactions that occur simultaneously within a sealed container based on the chemical reactions below:
H2 + AgNO3 → Ag + HNO3

HNO3 + Ca(OH)2 —> Ca(NO3)2 + H2O
If the scientist started off with 125 grams of AgNO3 , 125 grams of H2, and
125
grams of Ca(OH)2, how many grams of Ca(NO3)2, should be found at the end?

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

the answer is c. nacl

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.