After creating a Beer's Law plot using standard solutions of Q, you determined the slope of Beer's Law to be 0.543 M-1. Your unknown solution of Q tested in Part B of the experiment had an absorbance of 0.144. Determine the concentration (in molarity) of the unknown solution Q from Part B. Do not use scientific notation or units in your response. If Carmen adds zeros after the decimal place, your answer will still be graded correctly.
Answer : The concentration (in molarity) of the unknown solution Q is, 0.265
Explanation :
Using Beer-Lambert's law :
where,
A = absorbance of solution
C = concentration of solution
l = path length
= molar absorptivity coefficient
From the Beer's Law plot between absorbance and concentration we concldue that the slope is equal to and path length is 1 cm.
As we are given that:
Slope = 0.543 M⁻¹
and,
Slope =
Now we have to determine the concentration (in molarity) of the unknown solution Q.
Using Beer-Lambert's law :
Therefore, the concentration (in molarity) of the unknown solution Q is, 0.265
- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.
- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.
- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.
- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.
so the best choice is a.) 2 calcium (ca) atoms
im not exactly sure but i think its b!