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Answer :
Final Answer:
There are approximately 1.75 moles of Co in 103 grams of Co.
There are approximately 1.75 grams of Zn in a sample of Zn that contains the same number of moles as a 35.9 gram sample of As.
There are approximately 183.6 grams of Sr in 1.60 moles of Sr.
Explanation:
To calculate the number of moles of a substance, you can use the formula:
moles = mass / molar mass
1. Moles of Co in 103 grams:
The molar mass of Co (cobalt) is approximately 58.93 g/mol. Using the formula, we find:
moles of Co = 103 g / 58.93 g/mol ≈ 1.75 moles.
2. Grams of Zn in a sample with the same moles as As:
First, find the moles of As using its molar mass (74.92 g/mol):
moles of As = 35.9 g / 74.92 g/mol ≈ 0.479 moles.
Then, use this moles value to find the mass of Zn:
mass of Zn = moles of Zn * molar mass of Zn (65.38 g/mol) ≈ 0.479 * 65.38 ≈ 31.37 grams.
3. Grams of Sr in 1.60 moles:
The molar mass of Sr (strontium) is approximately 87.62 g/mol. Using the formula:
grams of Sr = 1.60 moles * 87.62 g/mol ≈ 140.29 grams.
In summary, the calculations above show the relationships between mass, moles, and molar mass for cobalt, zinc, and strontium based on the given data.
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