The Mole Concept & Stoichiometry

Question 1

What is ‘relative atomic mass’?

Answer 1

The relative atomic mass of an element is the ratio of the average mass of one atom of the isotope to 1/12 of the mass of an atom of 12C isotope.

Question 2

What is ‘relative isotopic mass’?

Answer 2

The relative isotopic mass of an isotope is the ratio of the mass of one atom of the isotope to 1/12 of the mass of an atom of 12C isotope.

Question 3

What is ‘relative molecular mass’?

Answer 3

The relative molecular mass of a substance is the ratio of the average mass of one molecule of the substance to 1/12 of the mass of an atom of 12C isotope.

Question 4

What is ‘relative formula mass’?

Answer 4

The relative formula mass of an ionic compound is the ratio of the average mass of one formula unit of the compound to 1/12 of the mass of an atom of 12C isotope.

Question 5

What is an isotope?

Answer 5

Isotopes are atoms of the same element that have the same number of protons and electrons but different number of neutrons.

Electrons are negligible mass so not actl mentioned ah

Question 6

What is the formula for combustion of hydrocarbons?

Answer 6

CxHy + (x + y/4) O2 –> xCO2 + y/2 H2O

Question 7

What does ICE in ICE box method stand for?

Answer 7

Initial, Change, End