Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances
Answer:
Extracytoplasmic-Function Sigma Factor of Escherichia coli
Explanation:
<span>(1) convert body mass in lb to kg
211 lb = (211 lb)*(1 kg/2.2046 lb) = 95.71 kg
(2) calculate the amount of caffeine required for a person of that mass at the LD50
(150 mg/kg)*(95.71 kg) = 14356 mg
(3) convert % (w/w) to % (w/v)
0.61% (w/w) = 0.61 g/100 g = (0.61 g)/((100 g)/(1.00 g/mL)) = 0.61 g/100 mL
(4) calculate the volume that contains the amount of caffeine calculated
14356 mg = 14.356 g = (14.356 g)/(0.61 g/100 mL) = 2353 mL</span>
The equilibrium vapour pressure is typically the pressure exerted by a liquid .... it is A FUNCTION of temperature...
Explanation:
By way of example, chemists and physicists habitually use
P
saturated vapour pressure
...where
P
SVP
is the vapour pressure exerted by liquid water. At
100
∘
C
,
P
SVP
=
1
⋅
a
t
m
. Why?
Well, because this is the normal boiling point of water: i.e. the conditions of pressure (i.e. here
1
⋅
a
t
m
) and temperature, here
100
∘
C
, at which the VAPOUR PRESSURE of the liquid is ONE ATMOSPHERE...and bubbles of vapour form directly in the liquid. As an undergraduate you should commit this definition, or your text definition, to memory...
At lower temperatures, water exerts a much lower vapour pressure...but these should often be used in calculations...especially when a gas is collected by water displacement. Tables of
saturated vapour pressure
are available.