The mass of a 14.4% (by mass) solution is 8.02g. The density of the solution is
ID: 990495 • Letter: T
Question
The mass of a 14.4% (by mass) solution is 8.02g. The density of the solution is 1.072 g/mL. What is the mass of the water in this solution? 7.36 g 6.87 g 0.00687 kg 1.24 g 9.37 g Which of the following gases is expected to have a higher solubility in water than what is predicted using Henry's law? CH_4 Ar H_2 N_2 NH_3 According to Raoult's law, which statement is false? The greater the pressure of a gas over a solution the greater its solubility. The vapor pressure of a solvent over a solution is less than that of pure solvent. Ionic solutes dissociate in solution causing an enhancement of all colligativc properties. The solubility of a gas increases as the temperature decreases. The vapor pressure of a solvent over a solution decreases as its mole fraction increases.Explanation / Answer
1.
totla mass = 8.02
mass of substnace = 14.4/100*8.02 = 1.15488 g of substance
mass of water = 8.02-1.15488 = 6.86512 g
nearest answer is 6.87 g (or also C since it is in kg)
2.
expect NH3 to have a higher solubility, since it will dissolve to form
NH3+ H2O <--> NH4+ + OH-
which is much more soluble than the gas itself
3.
a. FALSE, this is Hanrys law
b.
False, it is not always the case, if the solutoin is mixed with a higher volatile, will be high not low
c.
True, for ionic properties, we use van't hoff
d.
this is henrys law
e.
true, specially at low concnetrations
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