Which of the following sugars is a ketose? A. Mannose
B. Galactose
C. Fructose
D. Glucose

Fructose

Explanation:

A ketose is a monosaccharide  containing one ketone group (RCOR) per molecule.

This means to identify a ketose, one has to look for the ketone group in the structural formuar of the compound.

Mannose - This is an aldose. It contains the aldehyde functional group.

Galactose - This is an aldose. It contains the aldehyde functional group.

Fructose - This is a keose. It contains the Ketone Functional group.

Glucose - This is an aldose. It contains the aldehyde functional group.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

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