Final answer:
To calculate the percentage of caffeine in tea, divide the mass of caffeine in the tea by the mass of the entire tea sample and multiply by 100%. For example, if a tea sample weighs 10 grams and contains 0.5 grams of caffeine, the percentage of caffeine is 5%.
Step-by-step explanation:
To calculate the percentage of caffeine in tea, you need to know the mass of caffeine in the tea and the mass of the entire tea sample. Then, you can use the following formula:
Percentage of caffeine = (Mass of caffeine / Mass of tea sample) * 100%
For example, if you have a tea sample weighing 10 grams and it contains 0.5 grams of caffeine, you can calculate the percentage of caffeine as follows:
Percentage of caffeine = (0.5 g / 10 g) * 100% = 5%