Answer:
81.0°C
Explanation:
<em>Kb benzene = 2.5°C/m</em>
<em />
The addition of a solute to a pure solvent produce an elevation in boiling point regarding to boiling point of pure solvent. This phenomenon follows the equation:
ΔT = Kb×m×i
<em>where ΔT represents the increasing in boiling point, Kb is the elevation boiling point constant of the solvent (2.5°C/m for benzene), m is molality of solution (Moles solute / kg solvent) and i is Van't Hoff factor (1 for a non-electrolyte solute as naphthalene).</em>
<em />
Moles of 11.5g of naphthalene (Molar mass: 128.17g/mol) are:
11.5g × (1mol / 128.17g) =<em> 0.0897 moles of naphthalene in 250.0g = 0.250kg of benzene.</em>
Molality is:
0.0897 moles of naphthalene / 0.250kg of benzene = 0.359m
Replacing in the equation:
ΔT = Kb×m×i
ΔT = 2.5°C/m×0.359m×1
ΔT = 0.90°C
That means the solution prepared has an elevation in boiling point of 0.90°C. As boiling point of pure benzene is 80.10°C, boiling point of the solution is:
80.10°C + 0.90°C =
<h3>81.0°C</h3>
We first write the chemical equation:
2HgO → 2Hg + O₂
Next, we calculate the moles of HgO present:
moles = 3 / 216.59
moles = 0.014
Each mole of oxygen gas needs 2 moles of HgO to be produced.
Theoretical moles of oxygen gas produced = 0.014 / 2
= 0.007
Theoretical mass of oxygen = 0.007 x 32 = 0.224 grams
Percentage yield = actual yield / theoretical yield x 100
= 0.195 / 0.224 x 100
= 87.0%
They will repeal(that is the correct answer to the question)<
I LOVE balancing chemical equations!
Answer:
2 Zn + 2 HCl -> 2 ZnCl + 1 H₂
Explanation:
These coefficients correct balance this equation.
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