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Where, and how does hydrogen-bonding occur? Does such bonding occur in $HCF_3$?
Hydrogen bonding occurs where HYDROGEN is bound to a strongly electronegative element, i.e. hydrogen is bound to fluorine, nitrogen, or oxygen. In $"fluoroform"$, the hydrogen is bound to carbon not...
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In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. Hydrogen + Oxygen $->$ water. If you burn 58.1 g of hydrogen and produce 519 g of water how much oxygen reacted?
The stoichiometrically balanced equation tells us unequivocally that $1$ $mol$ dihydrogen reacts with $0.50$ $mol$ dioxygen to give $1$ $mol$ water. $"Moles of dihydrogen"$ $=$ $(58.1*g)/(2.02*g*mol)$ $=$ $28.7*mol$ $H_2$ $"Moles...
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A 2.01-L sample of O2(g) was collected over water at a total pressure of 785 torr and 25°C. When the O2(g) was dried (water vapor removed), the gas has a volume of 1.92 L at 25°C and 785 torr. How would you calculate the vapor pressure of water at 25°C?
At constant number of mole $n$ and Temperature $T$, using the $PV=nRT$ we can write: $P_1V_1=P_2V_2$ We should calculate the pressure of pure $O_2$ in a $2.01L$ volume: $P_1=(P_2V_2)/V_1=(785" torr"xx1.92cancel(L))/(2.01cancel(L))=750"...
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At 20°C the vapor pressure of benzene (C6H6) is 75 torr, and that of toluene (C7H8) is 22 torr. Assume that benzene and toluene form an ideal solution.
What is the composition in mole fractions of a solution that has a vapor pressure of 40. torr at 20°C?
The idea here is that the vapor pressures of benzene and toluene will contribute to the total vapor pressure of the solution proportionally to their respective mole fraction - this...
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The vapor pressure of water at 20 C is 17.5mmHg. What is the vapor pressure of water over a solution prepared from 200g of sucrose ($C_12H_22O_11$) and 112.3 g of water?
$"Raoult's Law"$ tells us that in an ideal solution, the vapour pressure of a component is proportional to fraction of that component in solution. $"Mole fraction of sucrose:"$ $="Moles...
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How would the vapor pressure of a solution that contains .5 mol of $CaCl_2$ in 1.0 kg of water compare with the vapor pressure of a solution that contains 1.5 mol of glucose in 1.0 kg of water?
Calcium chloride speciates in aqueous solution to give calcium ion and 2 equiv chloride ion. The number of particles in solution should be the same as the number of particles...
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The vapor pressure of ethanol is 100 mmHg at 34.9°C. What is its vapor pressure at 55.5°C?
Chemists often use the Clausius-Clapeyron equation to estimate the vapour pressures of pure liquids: $color(blue)(bar(ul(|color(white)(a/a) ln(P_2/P_1) = (Δ_"vap"H)/R(1/T_1- 1/T_2)color(white)(a/a)|)))" "$ where $P_1$ and $P_2$ are the...
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A solution contains 3.95g of CS2 and 2.43g CH3COCH3.vapor pressures at 35°C of pure CS2 and pure CH3COCH3 are 616 torr and 332 torr respectively.Assume ideal ,calculate vapor pressure of each component n the total vapor pressure?
This problem requires you to have some idea about Raoult's Law, which allows you to calculate the partial vapor pressure of a liquid that's part of a mixture by using...
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A container of gas with a pressure of 450 kPa contains three different gasses -hydrogen, oxygen, and nitrogen. If the partial pressure of the hydrogen is 210 kPa and the partial pressure of the oxygen is 125 kPa, what is the partial pressure of nitrogen?
According to Dalton's law of partial pressures, the total pressure is equivalent to the sum of the pressures of the individual gases (if they were present alone). Therefore, the...
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A sample of hydrogen gas is collected over water at 25°C. The total pressure of the hydrogen and water vapor is 116.0 kPa. The partial pressure of water vapor at this temperature is 3.2 kPa. What is the pressure of the hydrogen gas alone?
This shouldn't feel too complicated... We know: what the vapor pressure of water vapor plus hydrogen gas is. what the vapor pressure of just water vapor is. Hence,...
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