Coffee is a pure substance
Answer:
International System of Units
Definition: A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.
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Answer:
1 atmospheric pressure = 760.0 mm Hg
Thus 580 mm Hg = (580 mm Hg/(760 mm Hg/atm))
= 0.763 atm
The pressure would go down because the movement of the gas would slow essentially it would be less compact
Answer:
13C NMR
Explanation:
Both types of NMR will do the job, but 13C NMR makes the clearest distinction among your compounds, shown below as A, B, and C.
13C NMR
13C NMR is unambiguous, because we can distinguish by the number of peaks in the spectra.
Compound A has four non-equivalent carbon atoms. It will give four peaks.
Compound B has two sets of equivalent carbons: the methyl groups and the alkene carbons. It will give two peaks.
Compound C has equivalent methyl groups. It will give three peaks.
1H NMR
Compound A will show four groups of protons in a 3:2:1:2 ratio with complicated splitting patterns
Compounds B and C have equivalent methyl groups and alkene hydrogens. They will each have two peaks in a 3:1 ratio. However, the methyl groups in B will be a doublet (J = 7 Hz) while those in C will be essentially a singlet (J ≈ 1 Hz).