Question

Expt. No. Before Reaction Total mass in grams of Fe2O3 + Al 1 15.561 2 25.448 3 20.554 After Raction Total mass in grams of Fe2O3 + Al + Fe + Al2O3 30.683 50.315 40.816 Mass change in grams Massafter - Massbefore 15.122 24.867 19.816 Equations (1.1.3-1.1.5) for the mean, variance, and standard deviation and the Excel formulas for their determination are available in No Penalty hint Hint Eqn. (1.1.3-1.1.5). If you are unsure how to complete this section of the question, assistance is available in Hint bc. Scroll down to open a Hint b. Use equation (1.1.3) to calculate the mean of the mass change determinations. Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 19.938 c. Use equation (1.1.5) to calculate the standard deviation of the mass change determinations. Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 3.981 g g g g

          Expt. No.
Before Reaction
Total mass in grams of
Fe2O3 + Al
1
15.561
2
25.448
3
20.554
After Raction
Total mass in grams of
Fe2O3 + Al + Fe + Al2O3
30.683
50.315
40.816
Mass change in grams
Massafter - Massbefore
15.122
24.867
19.816
Equations (1.1.3-1.1.5) for the mean, variance, and standard deviation and the Excel formulas for their determination are available in No Penalty
hint Hint Eqn. (1.1.3-1.1.5).
If you are unsure how to complete this section of the question, assistance is available in Hint bc.
Scroll down to open a Hint
b. Use equation (1.1.3) to calculate the mean of the mass change determinations.
Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 19.938
c. Use equation (1.1.5) to calculate the standard deviation of the mass change determinations.
Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 3.981
g
g
g
g

Expt. No.
Before Reaction
Total mass in grams of
Fe2O3 + Al
1
15.561
2
25.448
3
20.554
After Raction
Total mass in grams of
Fe2O3 + Al + Fe + Al2O3
30.683
50.315
40.816
Mass change in grams
Massafter - Massbefore
15.122
24.867
19.816
Equations (1.1.3-1.1.5) for the mean, variance, and standard deviation and the Excel formulas for their determination are available in No Penalty
hint Hint Eqn. (1.1.3-1.1.5).
If you are unsure how to complete this section of the question, assistance is available in Hint bc.
Scroll down to open a Hint
b. Use equation (1.1.3) to calculate the mean of the mass change determinations.
Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 19.938
c. Use equation (1.1.5) to calculate the standard deviation of the mass change determinations.
Enter the value in grams to the nearest 0.001 g. Enter the unit using the symbol g. 3.981
g
g
g
g

Added by Teresa S.

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