1- Amount of Substance

Question 1

Define relative atomic mass.

Answer 1

The weighted average mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12th the relative atomic mass of carbon-12

Question 2

What is the equation for relative atomic mass?

Answer 2

Relative atomic mass(Ar)= average mass of an atom of an element/(1/12th mass of one atom of Carbon-12) or (average mass of an atom of an element x 12)/mass of one atom of carbon-12

Question 3

How many atoms are in 1 gram of Hydrogen or 12 grams of Carbon-12?

Answer 3

6.02x10^23

Question 4

What is the equation for number of moles?

Answer 4

Number of moles=mass in g/relative molecular mass

Question 5

What is the equation that links mass and number of moles?

Answer 5

Number of moles=mass/relative molecular mass

Question 6

What is the equation that links concentration and volume?

Answer 6

Concentration=number of moles/volume

Question 7

How many cm^3 in one dm^3?

Answer 7

1000cm^3=1dm^3