Flashcards in Amount Of Substance Deck (22)

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1

## What is the definition of Relative atomic mass (Ar) ?

### The mean mass of an atom of an element, divided by 1/12 of the mean mass of an atom of the carbon-12 isotope.

2

## What is the definition of Relative molecular mass (Mr) ?

### The mean mass of a molecule of a compound, divided by 1/12 of the mean mass of an atom of the carbon-12 isotope.

3

## What is the definition of a mole ?

### Is the amount of substance that contains the avogardo’s constant particles.

4

## What is the ideal gas equation ?

###
pV=nRT

. Pressure in P

. Volume in m3 (cubed)

. n is the number of moles

. R is gas’s constant ( 8.31)

. Temperature in K ( add 273)

5

## When under standard conditions, what 3 certain trends do gases and volatile liquids follow ?

###
. Pressure is proportional to temperature ( Gay-Lussac’s law)

. Volume is proportional to temperature. ( Charles’s law)

. Pressure and volume are inversely proportional.

6

##
What is Boyle’s law ?

Ideal gas equation

### Pressure times volume= constant

7

##
What is Charles’s law ?

Ideal gas equation

### Volume is proportional to temperature.

8

##
What is Gay-Lussac’a law?

Ideal gas equation

### Pressure is proportional to temperature.

9

## What is the definition of empirical formula?

###
The simplest whole number ratio of atoms of each element in a compound.

It is found by using molar ratios of each element.

10

## What is the definition of molecular formula?

###
The true number of each atom in the molecule.

It can be determined by using Mr of the empirical formula and the tire Mr of the molecule.

11

## What is the equation for percentage yield?

### % yield = experimental mass/ theoretical mass TIMES 100.

12

## What is the equation for atom economy ?

### Atom economy = Mr of desired product/ Mr of all reactants TIMES 100.

13

## What does high atom economy mean ?

###
There is little or no waste products and so is more economically viable for industrial scale manufacturing.

It also means less natural resources are used so used less energy.

14

## What is mm to cm ?

### Divide by 10

15

## What is cm to m ?

### Divide by 100

16

## What is m to km ?

### Divide by 1000

17

## What is mg to g ?

### Divide by 1000

18

## What is g to kg ?

### Divide by 1000

19

## What is kg to tones ?

### Divide by 1000

20

## What is cm3 to m3 ?

### TIMES by 10 to the power of -6.

21

## What is KPa to Pa ?

### TIMES by 1000

22