Flashcards in Chapter 3 Amount of Substance Deck (31)

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1

## What is the Avagadros constant?

### 6.02 x 10 ^23

2

## What is the equation to work out the number of moles given a mass?

### Moles = Mass/Mr

3

## The RAM in (g) of an element =

### 6.02 x 10 ^23

4

## What is the molar mass?

### The mass in grams in each mole of the substance UNIT: g mol -1

5

## The RAM or RMM (in g) =

### 1 mole of a substance = MOLAR MASS

6

## A standard solution is a solution of __________

### KNOWN CONCENTRATION

7

## What is the empirical formula?

### the simplest ratio of the atoms of each element in a compound

8

## What is the molecular formula?

### the actual number of atoms of each element in the compound

9

## What is the water of crystallization?

### The water in a lattice

10

## A solid salt which contains water of crystallization is a?

### Hydrated salt

11

## A salt that doesn't contain water is a?

### Anhydrous salt

12

## What is the relative molecular mass?

### is the average mass of a molecule compared to 1/12th of the mass of one atom of carbon-12

13

## What is the relative formula mass?

### Compares the mass of a formula unit with the mass of an atom of carbon-12.

14

## What is the water of crystallization experiment?

###
1) Weigh an empty clean, dry crucible and lid

2) Add 2g of hydrated salt into the weighted crucible

3) Weigh the crucible and the hydrated salt

4) Use a pipe clay traingle, support the crucible containing the hydrated salt on a tripod

5) Heat the crucible and contents gently for 1 minute

6) Then heat it strongly for a further three minutes

7) Leave the crucible to cool. Then weigh the crucible and anhydrous salt.

15

## What is the formula to find out the moles in a solution?

###
n = vol x conc

-----------------

1000

16

## What is the molar gas volume?

### The volume per mole of gas molecules at a given temperature and pressure

17

## How do you convert dm3 to cm3?

### x1000

18

## What is the ideal gas equation?

### pV = nRT

19

## IGE rearranged for T

### T = pV/nR

20

## IGE rearranged for n

### n = RT/pV

21

## IGE rearranged for V

### V = nRT/p

22

## IGE rearranged for p

### P = nRT/V

23

## IGE rearranged for R

### R = pV/nT

24

## How to convert from cm3 to m3?

### x 10^-6

25

## How to convert from dm3 to m3?

### x 10^-3

26

## How to convert *C to K?

### + 273

27

## How to convert from kPa to Pa?

### x 10^3

28

## What is the formula for percentage yield?

### Actual yield/ theoretical yield x100

29

## What is the limiting reagent?

### The reactant that is not in excess will be completely used up first and stop the reaction

30

## What is the atom economy?

### a measure of how well atoms have been utilised

31