Which instrument sounds an octave higher and has a range from C4 to G5?

The instrument that sounds an octave higher and has a range from C4 to G5 is the xylophone. This percussion instrument is known for its bright, resonant sound and consists of wooden bars that are struck with mallets. The xylophone's range typically covers from C4 (middle C) to G5, making it a versatile instrument in both orchestral and solo settings.

The vibraphone, while also a percussion instrument, usually has a range from F3 to F6 and produces a different timbre due to its metal bars and the presence of resonators. Chimes, made of metal tubes, can sound an octave higher, but their range is not limited to C4 to G5. Timpani, or kettle drums, have a much lower range, typically D2 to A4, making them unsuitable for matching the specified range in the question. Thus, the defining characteristics of the xylophone align perfectly with the question's requirements.