QQuestionChemistry
QuestionChemistry
What is the mass of 3.81 mol of PH₃?
A. 34.0 g
B. 3.81 g
C. 8.92 g
D. 130.0 g
E. 0.112 g
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Answer
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Step 1: To find the mass of 3.81 mol of PH₃, we need to multiply the number of moles by the molar mass of PH₃.
The molar mass of PH₃ can be calculated by adding up the atomic masses of each atom in the molecule: - Molar mass of P: 30.97 g/mol - Molar mass of H: 1.01 g/mol (there are three hydrogens in PH₃, so we multiply by 3)
Step 2: Calculate the molar mass of PH₃:
Molar mass of PH₃ = Molar mass of P + 3 * Molar mass of H Molar mass of PH₃ = 30.97 g/mol + 3 * 1.01 g/mol Molar mass of PH₃ = 30.97 g/mol + 3.03 g/mol Molar mass of PH₃ = 34.00 g/mol
Final Answer
The mass of 3.81 mol of PH₃ is approximately 130.1 g, which is closest to option D.
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