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In concentration of aqueous solutions find mass fraction and mole fraction using volume fraction of 0.8629 specific gravity of .4040 and MW solute of 59.00
0.8629×0.4040= 0.34860.3486/59= 0.006g=6/1000g
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1. A 10.0-liter flask contains 0.400 mole of H2, and 0.300 mole of N2 at 20°C. (a) What is the pressure, in atmospheres, inside the flask? (b) Calculate the mole fractions of the three gases?
Moles of Nitrogen = 0.3Moles of hydrogen = 0.4Volume = 10 LTemperature = 20 + 273 = 293 KPV = nRTPartial pressure of Nitrogen = 0.3×0.0821×208/10= 0.512atmPartial pressure of hydrogen=...
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assume a bottle of wine consist of an 11% solution (by weight) of ethanol in water. if the bottle of wine is chilled to -20 degree celsius will the solution begin to freeze ?
11/100×-20=-2.2=-20+-2.2=-22.2°C
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Ethanol burns according to the following equation. C2H5OH + 3O2 > 2CO2 +3H2O if 15.0 mole of C2H5OH burns this way, how many moles of oxygen are needed?
21,91 mole
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Normal water contains isotope of hydrogen 3H, tritium. It has a half-life of 12.3 years.
Determine the age of a bottle of wine whose 3H radiations is about 1/10 that present in
new wine.
Half-time T = 12,3 years. The age of a bottle t: T = - tln2/ln∆N -tln2 = Tln∆N t = Tln∆N/-ln2 = 12.3•ln(0,1)/-ln2 = 12.3•(-2.3) / -0.693 =40.82 years
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Normal water contain isotope of hydrogen H3 tritium. It has a half life of 12.è years.Determine the age of a bottle of wine whose H3 radiation is about 1/10 that present in new wine.
Half-time T = 12.3 years. The age of a bottle t: T = - tln2/ln∆N -tln2 = Tln∆N t = Tln∆N/-ln2 = 12.3•ln(0,1)/-ln2 = 12.3•(-2.3) / -0.693 =40.82 years
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If one mole of any substance contains 6.022 x 1023 particles, does one mole of monoatomic oxygen (O) contain the same number of atoms as one mole of diatomic oxygen (O2)?
one mole of diatomic oxygen (O2) = 5.0234 mol
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when 1 mole of potassium carbonate reacts with 2 mole HCI, 1 mole carbon dioxide and 1 mole water is formed. How many mole potassium chloride is produced?
K2CO3 + 2 HCl = 2 KCl + H2О + CO2According to the balanced equation, in the given conditions 2 moles of potassium chloride will be forned.
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A sample of rubbing alcohol solution contains ethanol, C2H5OH(l). If the sample contains 1.25x10^23 atoms of hydrogen in the ethanol, what amount in moles of ethanol is in the sample?
The amount of moles for atom\molecule\compound etc. can be calculated based on amount of atom\molecule\structural units etc. using Avogadro constant (NA=6.02x10^23) that represents 1 mole. One molecule of ethanol consists...
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How many moles of H2O are produced from 0.100 mole of C2H5OH shown in the reaction? C2H5OH + 3O2 2CO2 + 3H2O
According to the equation we obtain 3 molecules of H2O from each molecule of C2H5OH. Thus, from 0.100 mole of C2H5OH we will obtain 0.300 mole of H2O.
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