Answer:

Explanation:
Hello,
In this case, it is possible to determine the pressures of both helium and neon as shown below:

Now, one considers the total moles (addition between both neon's and helium's moles) and the total volume to compute the final pressure as shown below:

Best regards.
Answer:
What's the question so I can help?
I will just edit my answer when you have asked your question and post it here.
Explanation:
You just need to multiply the total mass by the decimal value of the part that is tin. 133.8*0.103=13.8g (following the rules of significant figures).
The answer is 35.4335
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