QQuestionChemistry
QuestionChemistry
What is the mass of 3.81 mol of PH₃?
- 34.0 g
- 3.81 g
- 8.92 g
- 130. g
- 0.112 g
12 months agoReport content
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 is the sum of the atomic masses of each atom in the molecule: P (30.97 g/mol) + 3 * H (3 x 1.01 g/mol) = 30.97 g/mol + 3.03 g/mol = 34.00 g/mol.
Step 2:: Now, multiply the number of moles (3.81 mol) by the molar mass (34.00 g/mol).
3.81 mathrm{~mol} imes frac{34.00 g}{1 mathrm{~mol}} = 129.54 g
Step 3:: To report the answer to the correct number of significant figures, we need to round the result to two decimal places (since 3.81 has two decimal places), giving us 130. g.
Final Answer
The mass of 3.81 mol of PH₃ is 130. g.
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