7. mole calculation

Question 1

Define Isotopes

Answer 1

1. same element
2. same proton number
3. different number of neutron

Question 2

define relative atomic mass

Answer 2

1. the average mass of an atom
2. Can be found in periodic table

Question 3

define molecular mass

Answer 3

1. average mass of a molecular
2. Can be found when u add together all the Ar of the atoms

Question 4

How much particles is in a mole?

Answer 4

6.02 x 10^23

Question 5

What is the formula to find number of moles?

Answer 5

number of moles=
mass(g) / molar mass

Question 6

what is the special formula for GAS only

Answer 6

number of mole=
volume of gas (dm^3) / 24dm^3

Question 7

What is the concentration of solution?

Answer 7

The amount of solute dissolved in a unit volume of solvent

Question 8

what are 2 formulas for concentration?

Answer 8

1. Mass of solute/vol of solvent
2. number of moles of solute/ vol of solvent