contestada

A solid, whose original weight was 8.492 grams, was dissolved in water. The
water solution was evaporated down to a small volume, then allowed to sit in a lab
drawer for a week. The resulting weight of the recovered solid was 9.045 grams.

a) Calculate the perfect recovery of the solid ._____
b) Give at least one reason why the percent recovery was greater than 100.0%