The henry's law constant for helium gas in water at 30 ∘c is 3.7×10−4m/atm; the constant for n2 at 30 ∘c is 6.0×10−4m/atm. a. if helium gas is present at 2.1 atm pressure, calculate the solubility of this gas. b. if n2 is present at 2.1 atm pressure, calculate the solubility of this gas.2. a solution is made containing 14.7 g of ch3oh in 186 g h2o. a. calculate the mass percent of ch3oh. b. calculate the molality of ch3oh.

Explanation:

1) Henry's law states that the amount of gas dissolved or molar solubility of gas is directly proportional to the partial pressure of the liquid.

To calculate the molar solubility, we use the equation given by Henry's law, which is:

where,

= Henry's constant

= partial pressure of gas

a)  

Putting values in above equation, we get:

The solubility of helium gas is

b)  

Putting values in above equation, we get:

The solubility of nitrogen gas is

2)

a) Mass of solute or methanol , m= 14.7 g

Mass of solvent or water , m'= 186 g

Mass of the solution = M = m + m' = 14.7 g + 186 g = 200.7 g

The mass percent of methanol is 7.32%.

b) Molality is defined as moles of solute per kilograms of solvent.

Moles of methanol =

Mass of solvent = 186 g = 0.186 kg

The molality of methanol is 2.4610 mol/kg.

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the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.