Answer : The initial temperature of system 2 is, 
Explanation :
In this problem we assumed that the total energy of the combined systems remains constant.
The mass remains same.
where,
= heat capacity of system 1 = 19.9 J/mole.K
= heat capacity of system 2 = 28.2 J/mole.K
= final temperature of system =
= initial temperature of system 1 =
= initial temperature of system 2 = ?
Now put all the given values in the above formula, we get
Therefore, the initial temperature of system 2 is, 
The answer is +1! Have a great day!
Answer:
A. the burning of fossil fuels within the Sun
Explanation:
Answer:
1 year- 1 mole
time in general- amount of matter
1 second- 1 atom/ particle