Iron, aluminum, and silicon.
This question uses weighted averages.
Since the average mass of element A is 63.6 amu and the only two isotopes are 63 and 65,
63.6 = x% * 63 + (1-x%) * 65
If you don't want to calculate this (like me), you can look at the answer choices.
If it was 100% A-63, the weight would be 63. Cross off D.
If it was 50/50, the weight would be 64. Cross off C.
So since the weighted average is 63.6, you would expect there to be more A-63 than A-65, so B is the only answer that makes sense.
.5 mol of A will be left over since 1.5 mol of A will be used for every 3 mol of B due to the 2:1 ratio established by the formula.
Explanation:
According to the given data, the turnover number can be calculated as follows.
Turnover number = 
Therefore, moles of 
hydrolyzed is as follows.
Moles of hydrolyzed = 
= 
= 0.00682 moles
Now, moles of hydolyzed per second is calculated as follows.
Moles of hydolyzed per second = 
= 
And,
Moles of enzyme = 
= 
= 
moles
Therefore, the value of 
is as follows.
= 
per second
= 
per minute
= 
per minute
Thus, we can conclude that the turnover number () of carbonic anhydrase (in units of 
) is per minute.
Answer:
I would say discovering who invented the radio.
Explanation:
The other ones can be solved by experiments and the "discovering who invented the radio" cannot be solved by an experiment.
hope this helps.
