3. At 300 K, 0.045 mol of hydrogen and fluorine are placed in a closed 1.5 L container and allowed to reach equilibrium.
H2(g) + F2(g) <----> 2HF(g) Keq = 4.3 at 300 K
What is the equilibrium concentration of HF(g)?
Initial concentration of H2 and F2 will be 0.045/1.5 = 0.03 M
"4.3 = \\frac{(2x)^2}{(0.03-x)(0.03-x)} \\\\\n\n\\sqrt{4.3} = \\frac{2x}{0.03-x} \\\\\n\n2.073 = \\frac{2x}{0.03-x} \\\\\n\n0.06219 -2.077x = 2x \\\\\n\n0.06219 = 4.077x \\\\\n\nx = 0.015 \\;M"
The equilibrium concentration of HF is "2 \\times 0.015 = 0.03 \\; M"
Answer: 0.03 M
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