Recognised as Musical note
C#8
- C#8
- 4,434.92 Hz
- MIDI 109
C#8 (enharmonically Db8) is MIDI note 109, sounding at 4,434.922 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.0773 m, and it sits in octave 8.
Pitch
Scientific pitch notationC#8
Enharmonic equivalentDb8the same pitch in equal temperament, spelled differently
MIDI note number109
Pitch classC# (1)
Octave8
As a sound wave
Wavelength in air0.0773 mat 343 m/s, dry air at 20 °C
Period0.2255 ms
Frequency one octave down2,217.461 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowC#7 · 2,217.46 Hz
Perfect fifth belowF#7 · 2,959.96 Hz
Semitone belowC8 · 4,186.01 Hz
Semitone aboveD8 · 4,698.64 Hz
Major third aboveF8 · 5,587.65 Hz
Perfect fifth aboveG#8 · 6,644.88 Hz
Octave aboveC#9 · 8,869.84 Hz
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Also reads as
NOTeCSHArP8 (chemical formula)
- Formula
- 490.427 g/mol
- 15 atoms
NOTeCSHArP8 has a molar mass of 490.427 g/mol, made up of 15 atoms across 8 elements: 1 × N, 1 × O, 1 × Te, 1 × C, 1 × S, 1 × H, 1 × Ar, 8 × P.
Molar mass
Molar mass490.427 g/mol
Total atoms per molecule15
Distinct elements8
Mass of one molecule8.1437319 × 10^-22 g
Molecules per gram1.2279383 × 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
N2.9%
O3.3%
Te26%
C2.4%
S6.5%
H0.2%
Ar8.1%
P50.5%
Nitrogen (N)14.007 g/mol, 2.856%
Oxygen (O)15.999 g/mol, 3.262%
Tellurium (Te)127.6 g/mol, 26.018%
Carbon (C)12.011 g/mol, 2.449%
Sulfur (S)32.06 g/mol, 6.537%
Hydrogen (H)1.008 g/mol, 0.206%
Argon (Ar)39.95 g/mol, 8.146%
Phosphorus (P × 8)247.792 g/mol, 50.526%
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