DJA1). Amount If Substance Flashcards Preview

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Flashcards in DJA1). Amount If Substance Deck (29):
1

Relative molecular mass / Mr

The mass of that molecule compared to 1/12 the number relative atomic mass of carbon 12

2

Avogadro's constant definition

The number of particles (atoms, ions, molecules, electrons etc...) in 1 mile of substance

3

Avogadro's constant symbol and number

L= 6.022x10^23 particles (don't need to know number)

4

Number of particles in x number of miles of substance y.....

number = moles times L (Avogadro's constant)

5

Limiting reagent=

Substance with least number of moles

6

Uncertainty = (number and %)

Half the smallest division
%= uncertainty divided by measurement x100
Must calculate all uncertainties in percentages then add them all together to get total percentage uncertainty

7

Ideal gas equation

PV=nRT

8

IDGE
P=

Pressure (Pa)

9

V

Volume (m^3)

10

n

Moles

11

R

Gas constant (Jmol^-1K^-1)

12

T

Temperature (K)

13

KPa -Pa

x1000

14

MPa-Pa

x1000000

15

dm^3 - m^3

/1000

16

cm^3 -m^3

/1000000

17

Degrees - kelvin

Degrees + 273

18

1 atm =

101000Pa

19

Gas constant=

8.31 Jmol^-1K^-1

20

Ideal gas has what type of particles

Point like
So when they collide no energy is lost

21

Molecular formula

The actual number of atoms of each element in a molecule

22

Empirical formula

The simples whole number ratio of atoms of each element in a compound

23

atom economy =

Mr of wanted product divided by Mr of products x 100

24

To find molecular from empirical

Empirical x Mr / formula mass of empirical

25

RFM/ Ar definition

The weighted average mass of an atom of an element taking into account all its naturally occurring isotopes relative to 1/12 the relative atomic mass of carbon 12

26

a

a

27

a

a

28

b

b

29

b

b