Recognised as Musical note
C#9
- C#9
- 8,869.84 Hz
- MIDI 121
C#9 (enharmonically Db9) is MIDI note 121, sounding at 8,869.844 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.0387 m, and it sits in octave 9.
Pitch
Scientific pitch notationC#9
Enharmonic equivalentDb9the same pitch in equal temperament, spelled differently
MIDI note number121
Pitch classC# (1)
Octave9
As a sound wave
Wavelength in air0.0387 mat 343 m/s, dry air at 20 °C
Period0.1127 ms
Frequency one octave up17,739.688 Hzdoubling the frequency
Frequency one octave down4,434.922 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowC#8 · 4,434.92 Hz
Perfect fifth belowF#8 · 5,919.91 Hz
Semitone belowC9 · 8,372.02 Hz
Semitone aboveD9 · 9,397.27 Hz
Major third aboveF9 · 11,175.3 Hz
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Also reads as
NOTeCSHArP9 (chemical formula)
- Formula
- 521.401 g/mol
- 16 atoms
NOTeCSHArP9 has a molar mass of 521.401 g/mol, made up of 16 atoms across 8 elements: 1 × N, 1 × O, 1 × Te, 1 × C, 1 × S, 1 × H, 1 × Ar, 9 × P.
Molar mass
Molar mass521.401 g/mol
Total atoms per molecule16
Distinct elements8
Mass of one molecule8.6580673 × 10^-22 g
Molecules per gram1.1549922 × 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
N2.7%
O3.1%
Te24.5%
C2.3%
S6.1%
H0.2%
Ar7.7%
P53.5%
Nitrogen (N)14.007 g/mol, 2.686%
Oxygen (O)15.999 g/mol, 3.068%
Tellurium (Te)127.6 g/mol, 24.473%
Carbon (C)12.011 g/mol, 2.304%
Sulfur (S)32.06 g/mol, 6.149%
Hydrogen (H)1.008 g/mol, 0.193%
Argon (Ar)39.95 g/mol, 7.662%
Phosphorus (P × 9)278.766 g/mol, 53.465%
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