A sample of the anticancer drug Taxol®, C₁₄H₁₁N₃O₄, contains 0.157 g of carbon - VCE - SSCE Chemistry - Question 15 - 2012 - Paper 1
Question 15
A sample of the anticancer drug Taxol®, C₁₄H₁₁N₃O₄, contains 0.157 g of carbon.
The mass, in grams, of oxygen in the sample is.
Worked Solution & Example Answer:A sample of the anticancer drug Taxol®, C₁₄H₁₁N₃O₄, contains 0.157 g of carbon - VCE - SSCE Chemistry - Question 15 - 2012 - Paper 1
Step 1
Calculate the Molar Mass of Taxol®
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Answer
To find the mass of oxygen in the sample, first calculate the molar mass of the compound Taxol® (C₁₄H₁₁N₃O₄).
The molar mass can be calculated as follows:
Carbon (C): 12.01 g/mol × 14 = 168.14 g/mol
Hydrogen (H): 1.01 g/mol × 11 = 11.11 g/mol
Nitrogen (N): 14.01 g/mol × 3 = 42.03 g/mol
Oxygen (O): 16.00 g/mol × 4 = 64.00 g/mol
Total Molar Mass of Taxol®:
M=168.14+11.11+42.03+64.00=285.28extg/mol
Step 2
Determine the Number of Moles of Carbon
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Answer
Calculate the number of moles of carbon in the sample using the mass of carbon:
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Answer
Since 0.05984 g does not perfectly match any of the provided options, we round this result. The closest value is 0.0624 g, which corresponds to option B.
