How is 4.09 Grams Determined in Chemistry Homework?

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The discussion centers on understanding how the specific weight of 4.09 grams is determined in a chemistry homework problem. The original poster is seeking clarification on the reasoning behind selecting this exact measurement, suggesting it likely relates to earlier parts of the problem that are not visible. There is an implication that the solution requires context from previous questions to fully comprehend the choice of 4.09 grams. The poster expresses frustration over the lack of information provided in the link shared. Overall, the inquiry highlights the importance of complete problem visibility in solving chemistry homework effectively.
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Homework Statement



http://img842.imageshack.us/i/cusersbenappdatalocalte.png/


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The Attempt at a Solution



The work is inside the link. I am just wondering how 4.09 grams is obtained? Like how did the person know to take out 4.09 grams?
 
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Very likely in parts a or b which we can't see.
 
If you are too lazy to copy questions, I am too lazy to think about the answer.
 
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