Solution : Teachers percent error is 7.5%
Percent error can be calculated by using the percent error formula.
[tex] Percent error = \frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100 [/tex]
Accepted value is the true value.
Measured values is the calculated value.
In our question the True value (Accepted value) is given as 40 g/mol
Measured value (calculated value) is given as 37 g/mol
We will plug in the accepted value and measured value in the percent error formula and calculate the value of percent error.
[tex] Percent error = \frac{\left | Accepted value - Measured value \right |}{Accepted value}\times 100 [/tex]
[tex] Percent error = \frac{\left | 40-37 \right |}{40}\times 100 [/tex]
[tex] Percent error = \frac{3}{40}\times 100 [/tex]
[tex] Percent error = 0.075\times 100 [/tex]
Percent error = 7.5 %
