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Delvig [45]
3 years ago
8

Over-the-counter hydrogen peroxide solutions are 3% (w/v). What is this concentration in moles per liter?

Chemistry
1 answer:
Marina CMI [18]3 years ago
5 0
<span>1 ml of water weighs 1 gram so 1 liter (1000 ml) weighs 1000 grams. A 3% solution (3% = 0.03) of hydrogen peroxide (w/v) would contain 1000 grams x 0.03 or 30 grams. The chemical formula of hydrogen peroxide is H2O2 and a mole weighs 34.0147 grams/mole. So 30 grams of H2O2 divided by 34.0147 grams/mole equals 0.88 moles of H2O2. The concentration of a 3% (w/v) hydrogen peroxide solution therefore contains 30 grams of H202 (or 0.88 moles of H202) per in a liter of water (or 1000 grams H20) would thus be 0.88 moles H2O2 per liter (0.88 moles H2O2/l) .</span>
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For the gaseous reaction of carbon monoxide and chlorine to form phosgene (COCl₂):(b) Assuming that ΔS° and ΔH° change little wi
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ΔH-T ΔS = ΔG

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the enthalpy change,  ΔH

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Using the formula, we obtain:

-220kJ/mol -T ΔS° = -206kJ/mol

220 kJ/mol +206 kJ/mol =T ΔS°.

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ΔG° = (450K)(-0.047kJ/mol)-220kJ/mol

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ΔG°=198.86 kJ/mol

Learn more about ΔG° here:

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