Stoichiometry

Question 1

Avogadro’s principle

Answer 1

One mole of any gas contains 6.02x1023 molecules and occupies the same volume at a given temperature and pressure.

Question 2

Dalton’s Law of Partial Pressures:

Answer 2

In a mixture of gases, the total pressure of the mixture is equal to the sum of the partial pressures of the individual constituent gases

Question 3

The Kinetic Theory of Gases explains the behaviour of gases. It states

Answer 3

i.the molecules in a gas are in continuous motion
ii. there are no intermolecular forces so the only interactions between the molecules are the collisions.
iii. all collisions are “elastic” so that the molecules bounce off each other and the total kinetic energy stays the same.An assumption of this theory is that in an ideal gas the molecules are far apart from each other and independent of each other

Question 4

Hess’s law

Answer 4

a reaction is carried out in a series of steps, Hfor the overall reaction will be equal to the sum of the enthalpy changes for the individual steps,” or simply: H1= H2+ H3

Question 5

Enthalpies of Formation

Answer 5

An enthalpy of formation, Hf, is defined as the enthalpy change for the reaction in which a compound is made from its constituent elements in their elemental forms

Question 6

Heat Capacity

Answer 6

The amount of energy required to raise the temperature of a substance by 1 K (1C) isits heat capacity.

Question 7

Specific heat capacity

Answer 7

The amount of energy required to raise the temperature of 1 g of a substance by 1 K