Kf = 1.86
Number of moles :
Molar mass <span> ethylene glycol = 62.0 g/mol
40.0 / 62.0 => 0.645 moles
Molality :
mass of solvent = 60.0 / 1000 => 0.06 kg
m = moles / kg solvent
m = </span><span>0.645 / 0.06
= 10.75 m
</span>Δt = Kf x molality
Δt = (- 1.86) x 10.75 => - 20.1ºC
<span>
Answer A
hope this helps!</span>
Answer:
600 seconds, or 10 minutes
Explanation:
300m/ 0.5m = 600s
Scientists use special tools to do their work. They gather data, or information, as they seek to learn about the world. In order to solve problems they must record data that is accurate and organized. This is an important part of the scientific method.
pKa= -log(ka)
= -log(2.3*10^-9)
= 8.64
Now pH can be calculated using equation:
pH=pka+log(BrO-)/(HBrO)
8.08 =8.64+log(BrO-)/(HBrO)
log(BrO-)/(HBrO)=8.08-8.64
= -0.56
(BrO-)/(HBrO)= 10^-0.56
=0.275