A student obtained 2.00 g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.56 g. What is the percent recovery of pure caffeine from crude

78.125%

Explanation:

From the question, we are informed that a student obtained 2.00g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.56g.

The percent recovery of pure caffeine from crude will be calculated as:

= Mass of pure caffeine / Mass of crude sample × 100

= 2.00 / 2.56 × 100

= 78.125%

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.