Calculations Flashcards Preview

Chemistry A Level > Calculations > Flashcards

Flashcards in Calculations Deck (16)
Loading flashcards...
1
Q

What is avogardo’s number?

A

6.022 *10^23

2
Q

Define relative atomic mass

A

Average of one atom compared to one twelfth of carbon-12

3
Q

Define relative molecular mass?

A

The average mass of a molecule compared to the mass of one atom of carbon-12

4
Q

Moles, mass and Mr equation

A

Moles= mass/Mr

5
Q

Ideal gas equation

A

PV=nRT

6
Q

Concentration equation

A

C=moles/volume

7
Q

How to convert to K

A

Add 273

8
Q

Cm3 to dm3 is?

A

Divide by 1000

9
Q

From cm3 to m3?

A

Divide by 1000,000

10
Q

dm3 to m3 ?

A

Divide by 1000

11
Q

Number of particles formula?

A

Number of particles= moles x avogardo’s constant

12
Q

Molecular formula?

A

Actual number of atoms in a compound

13
Q

Percentage yield

A

Actual yield/theoretical yield *100

14
Q

Percentage atom economy?

A

Mass of useful products/ mass of all reactants *100

15
Q

Define a mole

A

Amount of substance in grams that has the same number of particles as there are in atoms in carbon-12

16
Q

Formula for number of particles?

A

Number of particles= amount of substance (mols)* avogadro’s constant