Recognised as Musical note
A#8
- A#8
- 7,458.62 Hz
- MIDI 118
A#8 (enharmonically Bb8) is MIDI note 118, sounding at 7,458.62 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 0.046 m, and it sits in octave 8.
Pitch
Scientific pitch notationA#8
Enharmonic equivalentBb8the same pitch in equal temperament, spelled differently
MIDI note number118
Pitch classA# (10)
Octave8
As a sound wave
Wavelength in air0.046 mat 343 m/s, dry air at 20 °C
Period0.1341 ms
Frequency one octave up14,917.24 Hzdoubling the frequency
Frequency one octave down3,729.31 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age
Intervals from here
Octave belowA#7 · 3,729.31 Hz
Perfect fifth belowD#8 · 4,978.03 Hz
Semitone belowA8 · 7,040 Hz
Semitone aboveB8 · 7,902.13 Hz
Major third aboveD9 · 9,397.27 Hz
Perfect fifth aboveF9 · 11,175.3 Hz
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Also reads as
NOTeAsHArP8 (chemical formula)
- Formula
- 521.278 g/mol
- 14 atoms
NOTeAsHArP8 has a molar mass of 521.278 g/mol, made up of 14 atoms across 7 elements: 1 × N, 1 × O, 1 × Te, 1 × As, 1 × H, 1 × Ar, 8 × P.
Molar mass
Molar mass521.278 g/mol
Total atoms per molecule14
Distinct elements7
Mass of one molecule8.6560248 × 10^-22 g
Molecules per gram1.1552647 × 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%
As14.4%
H0.2%
Ar7.7%
P47.5%
Nitrogen (N)14.007 g/mol, 2.687%
Oxygen (O)15.999 g/mol, 3.069%
Tellurium (Te)127.6 g/mol, 24.478%
Arsenic (As)74.922 g/mol, 14.373%
Hydrogen (H)1.008 g/mol, 0.193%
Argon (Ar)39.95 g/mol, 7.664%
Phosphorus (P × 8)247.792 g/mol, 47.535%
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