Naturally occurring boron is composed of two isotopes. The percent abundance and the mass of each isotope are listed below: 19.99 the boron atoms have a mass of 10.013 amu and 80.1% of the boron atoms have a mass of 11.009 amu.
To calculate the average atomic mass of boron, you would set up the following calculation:
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Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

Element before carbon on the periodic table