formulae, equations and amounts of substance

Question 1

What are the formulas for the number of moles?

Answer 1

• mass/Mr
• concentration x volume/1000

Question 2

What is relative formula mass?

Answer 2

the mean mass of an atom of an element is one-twelfth of the mean mass of an atom of a carbon-12 isotope

Question 3

What is relative molecular mass?

Answer 3

the mean mass of an atom of a compound is one-twelfth of the mean mass of an atom of a carbon-12 isotope

Question 4

How do you calculate the true Mr?

Answer 4

Mr of empirical formula x multiplier

Question 5

what is the formula for determining the number of ions, atoms or molecules in a substance

Answer 5

no.of species = avogrado’s constant x moles

Question 6

what is the formula for determining the volume of a gas

Answer 6

volume = molar gas volume x moles

Question 7

how to convert from dm³ to cm³

Answer 7

x1000

Question 8

how to convert from m³ to dm³

Answer 8

x1000

Question 9

how to convert from m³ to cm³

Answer 9

x10⁶

Question 10

how to convert from cm³ to m³

Answer 10

/10⁶

Question 11

how to convert from cm³ to dm³

Answer 11

/10³

Question 12

how to convert from dm³ to m³

Answer 12

/10³

Question 13

formula for ideal gas law

Answer 13

pV =nRT

Question 14

how to convert from celcius to kelvins

Answer 14

+273

Question 15

what is molarity

Answer 15

the concentration of a solution in moles of a solute per dm³ of solvent

Question 16

what is a solute

Answer 16

a substance that is dissolved in a solution

Question 17

what is a solvent

Answer 17

the substance in which the solute dissolves

Question 18

what is a solution

Answer 18

a homogeneous mixture that forms when one substance dissolves another