Chemical Calculations - The Mole

Question 0

What is the modern relative atomic mass and why has the definition changed?

Answer 0

(Mass of 1atom of element) / (one 12th the mass of a gram of carbon-12)

As relative atomic masses are now measured by mass spectroscopy and volatile Carbon compounds are use extensively in mass spectroscopy.

Question 1

What was original relative atomic mass?

Answer 1

(Mass of 1atom of element) / (mass of 1 atom of hydrogen)

Question 2

What is the Avagadro’s number?

Answer 2

6.022*10^23

Question 3

Define the mole.

Answer 3

The amount of an element that contains the same number of atoms as 12g of Carbon-12

Question 4

What is the equation use for molar calculations?

Answer 4

Mole=mass/Ar

Question 5

Define relative isotopic mass.

Answer 5

Mass of one atom of that isotope divided by 1/12 the mass of 1 atom of carbon 12.

Question 6

Define relative molecular mass.

Answer 6

The mass of one molecule of a compound (or element e.g O2) divided by 1/12 the mass of Carbon-12

Question 7

Define Molar Mass.

Answer 7

Mass in grams of 1 mole of that particular item (atoms or molecules).

Question 8

What is a Molar solution?

Answer 8

When one mole of solute is dissolved In 1dm^3 a molar solution is produced. This is expressed as a 1M solution.