Structure 1.4

Question 1

Mole

Answer 1

A SI unit of amount of substance. One mole contains exactly Avogadro’s constant of elementary entities.

Question 2

How many grams of hydrogen contains 6.02x10^23 atoms?

Answer 2

1.00g

Question 3

What are the units of relative atomic mass?

Answer 3

it has no units as it is relative

Question 4

Units of Atomic mass of an element

Answer 4

g mol-1

Question 5

Molar mass

Answer 5

the mass of one mole of any substance. Same as molecular mass (for molecules) and formula mass (for ionic compounds.

Question 6

Empirical formula

Answer 6

The simplest whole number ratio of atoms of each element in a particle of the substance.

Question 7

Molecular formula

Answer 7

Shows the actual number of atoms of each element in a molecule of the substance.

Question 8

What does a 1.00 molar solution contain?

Answer 8

One mole of solute dissolved in a solvent to give a total volume of 1.00 dm^3 of solution.

Question 9

Concentration Units

Answer 9

mol dm^-3, this can be expressed by square brackets around the solute

Question 10

How is gas volume determined?

Answer 10

Only by the number of particles, the temp and pressure. The chemical nature of the gas is irrelevant.

Question 11

Avogadro’s Law

Answer 11

Equal volumes of all gases, when measured at the same temperature and pressure, contain an equal number of particles.