3. a beer's law plot for cu2+ was experimentally obtained. the slope of the beer's law plot was 435 l/mol (with a y-intercept = 0.001). a cu2+ solution of unknown concentration had an absorbance of 0.75. what is the molar concentration of cu2+ in the unknown solution?

0.00172 M

Explanation:

According to the Lambert's Beer law:-

Where, A is the absorbance

l is the path length

is the molar absorptivity

c is the concentration.

If a graph is plotted between the concentration and absorbance, then the slope is:- . So,

0.00172 is the molar concentration of in the unknown solution.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

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explanation: