What is the mass, in grams, of 1.20×1021 molecules of aspirin, c9h8o4?

The mass of given number of molecules of aspirin is 0.359 grams.

Explanation:

We are given:

Number of molecules of aspirin =

We know that:

Molar mass of aspirin = 180.16 g/mol

According to mole concept:

number of molecules are contained in 1 mole of a compound

Also, number of molecules of aspirin has a mass of 180.16 grams

So, number of molecules will have a mass of

Hence, the mass of given number of molecules of aspirin is 0.359 grams.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

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