Answer to Question #97183 in General Chemistry for Edith

Question

coal from a colliery contains 2.7% water. After drying, the "moisture free" residue contains 69.4% carbon. Determine the percentage of carbon on "wet basis".

Answer 1

Moist coal contains 2.7% water.

Percentage of Moist free coal in moist coal is 97.3 %.

Let the weight of moist coal is 100 gm.

The weight of moist free coal is 97.3 gm.

Moist free coal contains 69.4% Carbon.

Let the weight of moist free coal is x gm.

Carbon in x gm of moist free coal is 69.4x/100 gm

Carbon in 1 gm of moist free coal is 69.4/100 gm.

Carbon in 97.3 gm of moist free coal is 69.4×97.3/100 gm.

Carbon in 97.3 gm of moist free coal is 67.5262 gm.

Percentage of carbon in moist coal is 67.5262%.(Answer)