1. A student measures the height of a small lamp to be 32cm. According to the factory specifications, the lamp is actually 30cm. What is the percent error of the student's measurement?

6.67 %

Explanation:

Given that,

Measured height of a small lamp, l = 32 cm

Actual height, l' = 30 cm

We need to find the percent error of the student's measurement. Percent error is given by :

Putting all the values, we get :

So, the percent error of the student's measurement is 6.67 %.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)