First question

Balaneced:

Find how many moles potassium iodide it is in 345.0 grams

Find how many moles potassium nitrate there is for 2.078 moles 

Find how many grams potassium nitrate there is in 2.078 moles 

Second question

This problem is requiring us to find the half life of the element. We can solve this problem by using the equation
as shown: A=Aoe^-(ln2/t)T where A is the final amount (5 kilogram), Ao is
the initial amount (40.0 kilogram), t is the half-life (required) and lastly T
time elapsed (4.0 years). Plug in the values in the equation and you should
get 1.33 years as the half life.
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Answer:
more energy
Explanation:
shorter lengths in bonds require more energy because atoms are strongly connected in short length bonds
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