To find the percent error we must first calculate the actual error which is how far away from the actual value the experimental value is:
1.44 g - 1.31 g = 0.13 g
To find the percentage error we must take this value, divide it by the actual mass that should have been produced and multiply it by 100%:
(0.13/1.44) * 100% = 9.02%
Hope this helps!
