Recognised as Musical note
C9
- C9
- 8,372.02 Hz
- MIDI 120
C9 is MIDI note 120, sounding at 8,372.018 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.041 m, and it sits in octave 9.
Pitch
Scientific pitch notationC9
MIDI note number120
Pitch classC (0)
Octave9
As a sound wave
Wavelength in air0.041 mat 343 m/s, dry air at 20 °C
Period0.1194 ms
Frequency one octave up16,744.036 Hzdoubling the frequency
Frequency one octave down4,186.009 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowC8 · 4,186.01 Hz
Perfect fifth belowF8 · 5,587.65 Hz
Semitone belowB8 · 7,902.13 Hz
Semitone aboveC#9 · 8,869.84 Hz
Major third aboveE9 · 10,548.08 Hz
Perfect fifth aboveG9 · 12,543.85 Hz
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Also reads as
NOTeC9 (chemical formula)
- Formula
- 265.705 g/mol
- 12 atoms
NOTeC9 has a molar mass of 265.705 g/mol, made up of 12 atoms across 4 elements: 1 × N, 1 × O, 1 × Te, 9 × C.
Molar mass
Molar mass265.705 g/mol
Total atoms per molecule12
Distinct elements4
Mass of one molecule4.4121353 × 10^-22 g
Molecules per gram2.2664763 × 10^21
Name
NameNot in the name tablea name cannot be worked out from a formula alone: isomers share formulas, and naming depends on bonding the formula does not show
Composition by mass
N5.3%
O6%
Te48%
C40.7%
Nitrogen (N)14.007 g/mol, 5.272%
Oxygen (O)15.999 g/mol, 6.021%
Tellurium (Te)127.6 g/mol, 48.023%
Carbon (C × 9)108.099 g/mol, 40.684%
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