A sample of gas occupies 37.5 with 2.7 moles present. If the volume were increased to 69 L how many moles of gas were added?

Asource of sound is detected in the middle of a room. which can account for a decrease in sound intensity for an observer? a. a decrease in speed from the source b. an increase in speed from the source c. a decrease in the radius from the source d.an increase in the radius from the source