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3 years ago

Forming a hypothesis is accomplished through___ reasoning

Chemistry

1 answer:

mixer [17]3 years ago

5 0

Scientific would be the word to fill in the blank

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Cells

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3 years ago

How much elements are in the periodic table?

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3 years ago

15 liters of an ideal gas at STP will have ____ moles of particles

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The volume occupied by one mole of any gas at standard temperature(0o) and pressure(1 atm) is 22.4 litres. This volume is a close approximation and different gases vary slightly. The molar volume of any gas at S.T.P. is 22.4L .The mole of any gas can therefore be found using the expression on the right.

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3 years ago

A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, t c , wa

KatRina [158]

Answer:

Average plate height: 67,4μm

Resolution: 3,10

Resolutin with increase N by a factor of 1,5: 3,80

Explanation:

Average plate height is the average between plate height of aspartame and caffeine.

Plate height is:

$H = \frac{L}{16(\frac{t_R}{W} )^2}$

For aspartame: $H = \frac{0,241x10^{6}um}{16(\frac{267,1s}{18,9s} )^2}$

H = 75,4 μm

For caffeine: $H = \frac{0,241x10^{6}um}{16(\frac{216,7s}{13,6s} )^2}$

H = 59,33 μm

Average plate height is:

(59,3μm + 75.4μm)/2= 67,4μm

The resolution formula is:

$R = \frac{2(t_{R2}-t_{R1})}{(w_2+w_1)}$

Replacing:

$R = \frac{2(267,1s-216,7s)}{(18,9s+13,6s)}$

R = 3,10

As resolution is proportional to the square root of the number of theoretical plates, the increasing of 1,5 in the number of theoretical plates increases the resolution by a factor of √1,5 ≈ 1,22

That means resolution would be:

R 1,5N = 3,10×√1,5= 3,80

I hope it helps!

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3 years ago