How many total atoms are there in the following molecule? kclo3
5
3
9

There in KClO3, there are:
K = 1
Cl = 1
O = 3
So, in total = 1+1+3 = 5

So, option A is your answer!

Hope this helps!

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.