Laws, Numbers And Equations

Question 1

What is relative atomic mass?

Answer 1

Relative mass of atom without a unit.

Question 2

Relative molecular mass

Answer 2

Mass of molecule of a compound relative to mass of an atom if carbon 12 isotope

Question 3

Molecular weight of a compound

Answer 3

The sum of the atomic weights if the atoms given by the molecular formulae.

Question 4

Equation of finding a mole.

Answer 4

Number of moles=mass/ Molecular mass

Question 5

Equation for moles and volume

Answer 5

Number of moles=volume/molar volume

Question 6

Equation for concentration

Answer 6

Number of moles=concentration x volume

Question 7

What were the three things in Dalton’s atomic theory?

Answer 7

1. Matter is composed of tiny indivisible particles called atoms.
2. All atoms of the one elements are identical but different from atoms of other elements.
3. Chemical reaction consist of combining, separating or rearranging atoms in simple whole number ratios.

Question 8

What is Gay-Lussac’s Law?

Answer 8

The ratio of the volumes of gases involved in a chemical reaction is expressed by small whole numbers.

Question 9

Avogadro’s Law

Answer 9

Equal volumes of any gas under the same conditions of temperature and pressure contain the same number of molecules.

Question 10

Equation for number of atoms.

Answer 10

Number of moles=number of atoms/Avogadro’s number

Question 11

What is Avogadro’s number?

Answer 11

Exactly 12g of carbon 12 atoms
6.02x10^23
A mole of any substance.