water is the only common substance that when you freeze it, it's volume increases.
when the pipe originally held the "all full" volume and the the water expanded, it put a tremendous amount of pressure on the pipe. enough pressure and the pipe would burst.
n(nacl) = 2.3 mol
m(h₂o) = 0.155 kg
kb = 0.51 °c·kg·mol⁻¹
(a) molal concentration
the formula for molal concentration (b) is
b = moles of solute/kilograms of solvent
b = 2.3/0.155
= 14.8 mol/kg
(b) boiling point elevation
the formula for the boiling point elevation δtb is
δtb = ikb·b
i is the van’t hoff factor: the number of moles of particles you get from a solute.
nacl(s) ⟶ na⁺(aq) + cl⁻(aq)
1 mol nacl ⟶ 2 mol particles i = 1
δtf = 2 × 0.51 × 14.8
= 15.1 °c
(c) boiling point
tb = tb° + δtb
= 100.0 °c + 15.1 °c
= 115 °c
answer: the partial pressure of hydrogen is 93.9 kpa.
to calculate the partial pressure of hydrogen, we will follow dalton's law.
this law states that the total pressure of a mixture of gases is equal to the sum of the individual pressures exerted by the constituent gases.
according to the question,
we are given:
putting values in above equation, we get:
hence, the partial pressure of hydrogen is 93.9 kpa.
yup answer is one week just finished the test