A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. c.) How many grams of Cu(NO3)2 are present in 100 grams of solution? How many grams of water?
A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. c.) How many grams of Cu(NO3)2 are present in 100 grams of solution? How many grams of water?
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
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Question
A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11.
c.) How many grams of Cu(NO3)2 are present in 100 grams of solution?
How many grams of water?
Expert Solution
Analysis
Given : y = 0.345x - 0.11
Mass of solution = 100 grams
To find : Grams of Cu ( NO3 )2
Grams of water
Solution : Number of moles is ratio of given mass to molar mass. The number of moles can be calculated as shown below :
n = given mass / molar mass
Mass percent can be calculated as shown below :
Mass % = (Mass of solute ×100) / Mass of solution
Mass of solution = mass of solute + mass of solvent
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