Question

8.2 calculate the number of moles of magnesium ribbon added to each flask.
a. 0.3 g/atomic weight of mg (24.3 g/mole)
b. 0.6 g/ atomic weight of mg (24.3 g/mole)
c. 1.2 g/ atomic weight of mg (24.3 g/mole)

Explanation:

Step1: Apply the formula for moles

The formula for calculating the number of moles \(n\) is \(n=\frac{m}{M}\), where \(m\) is the mass and \(M\) is the molar mass.

Step2: Calculate for part a

For \(m = 0.3\space g\) and \(M=24.3\space g/mol\), \(n=\frac{0.3}{24.3}\approx0.0123\space mol\)

Step3: Calculate for part b

For \(m = 0.6\space g\) and \(M = 24.3\space g/mol\), \(n=\frac{0.6}{24.3}\approx0.0247\space mol\)

Step4: Calculate for part c

For \(m = 1.2\space g\) and \(M=24.3\space g/mol\), \(n=\frac{1.2}{24.3}\approx0.0494\space mol\)

Answer:

a. \(0.0123\space mol\)
b. \(0.0247\space mol\)
c. \(0.0494\space mol\)