Answer: 2738
Explaining: you gotta add
Protactinium
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Answer: Thus 8.41 g was the mass of the original sample
Explanation:
To calculate the moles :

According to stoichiometry :
As 3 moles of
are produced by = 2 moles of 
Thus 0.103 moles of
are produced by =
of 
Mass of 
Thus 8.41 g was the mass of the original sample.
Answer:
Lets Write Down the Given Initial Conditions.



In Order to Solve for the Unknown: 
we must use the Ideal Gas Law to Solve for the Second Unknown pressure:

Then Rearrange this equation in a form where P2 can be solved from:

Then Insert the Values from above to solve:

The Answer is : 1830 mmHg considering sig figs