Question

if the expected mass of a substance is 100 grams, but the measured mass is 98 grams, what is the percent error? 3% 1% 2% 4%

Explanation:

Step1: Identify the formula

Percent error = $\frac{\vert\text{Expected value}-\text{Measured value}\vert}{\text{Expected value}}\times100\%$

Step2: Substitute values

$\text{Expected value}=100$ g, $\text{Measured value}=98$ g. So, $\vert100 - 98\vert=2$, and $\frac{2}{100}\times100\%$

Step3: Calculate result

$\frac{2}{100}\times100\% = 2\%$

Answer:

C. 2%