Answer:
9
Explanation:
The structure of fluorophore used in the experiments has been drawn in the attachment. And from the drawing counting we can say that there are 9 sp2-hybridized carbon atoms present. Fiuorophores are a fluorescent chemical compound that can re-emit light upon light excitation. Normally used to produce absorbance and emission spectra.
Half life is defined as the time when the final concentration reduced to half of the initial value.
Thus, for first half life, the remaining percentage of the reactant is 50 percent that is 
Now, for second half life, the remaining percentage will be 50 percent of the remaining 50 percentage that is 
or 
Thus, general formula for n half lives =
Now, 98.4 years is equal to eighth times 12.3 years that is 
=
remaining material.
Therefore, mass of the nuclide will remain after 98.4 years= 
= 
Mass of remaining nuclide after 98.4 years =
The volume of 1 mol of an ideal gas become half if Half the gas escapes.
<h3>What is Ideal gas equation? </h3>
An ideal gas is defined as the hypothetical gas which does not and can not be exist in our universe. The ideal gas is an concept which scientists proposed to use it as a model by giving the assumption of multiple properties which all gases follow and make it easier to deal with the gases, by predicting their behavior, and calculating the values of their properties in all different situations and scenarios.
Mathematical expression for Ideal gas equation:
PV = nRT
where,
P is the pressure of the gas
V is the volume of the gas
n is the number of moles of the gas
R is the gas constant
T is the temperature of the gas.
As we can see that, number of moles of gas is directly proportional to the volume of the gas.
Thus, if half of the gas escaped and pressure and temperature remains constant, the number of moles also become half.
Thus, the volume of 1 mol of an ideal gas become half if Half of the gas escapes.
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PH scale is used to determine how acidic or basic a solution is.
we have been given the hydrogen ion concentration. Using this we can calculate pH,
pH = - log[H⁺]
pH = - log (1 x 10⁻¹ M)
pH = 1
using pH can calculate pOH
pH + pOH = 14
pOH = 14 - 1
pOH = 13
using pOH we can calculate the hydroxide ion concentration
pOH = - log [OH⁻]
[OH⁻] = antilog(-pOH)
[OH⁻] = 10⁻¹³ M
hydroxide ion concentration is 10⁻¹³ M
