1.2 Mole Concept

Question 1

Formula to find moles

Answer 1

N= mass/molar mass

N= MV/1000

Question 2

Hotlw to find something ehen something is not given?

Answer 2

Assume the mass is 100g

Question 3

Diff in empirical formula and molecular formula

Answer 3

Empirical formula
Is the simplest number ratio of the atoms of each elin a substance

Molecular formula
Is the exact number of ratio of the atoms of each element in the smallest unit In a substance

Question 4

How to find the empirical formula using table?

Answer 4

Element
Mass
Mole
Simplest ratio

Question 5

How to measure concentration

Answer 5

Molarity , M

Molality, m
Percentage by mass, %w/w

Percentage by volume, %v/v

Mole fraction, x

Question 6

Solute + sovent = solution

Answer 6

-

Question 7

What is Molarity

Answer 7

Number of moles of solute dissolved per unit volume

Mol dm^-3
Mol L^-1

Mol of solute/ Litre of solution

Question 8

What is molality

Mol kg-1

Answer 8

Moles of solutes in a kg of solvent

Mass yg determine kan dia

Question 9

What is percentage by mass?

And volume

Answer 9

The percentage of volume of solute per volume of solution

Question 10

How to find mole fractions?

Answer 10

Xa =Na/ N total

Question 11

D. Empirical formula

Answer 11

shows the simplest whole-number ratio of the atoms in a substance

Question 12

D molecular formula

Answer 12

shows the exact number of atoms of each element in the smallest unit of a substance

Question 13

D. Empirical formula

Answer 13

shows the simplest whole-number ratio of the atoms in a substance

Question 14

D molecular formula

Answer 14

shows the exact number of atoms of each element in the smallest unit of a substance

Question 15

Remember that when the question is about volume and stp -

Answer 15

You need to convert the volume to
L aka dm^3

Ml——> L

Divide by 1000

Question 16

How to find the mass of carbon

In 1.1g of CO2

Answer 16

(mm C/mm CO2)x mass of co2

Make sure if the C is 2 (C2O2)
The mm of c must times with the molar mass

Question 17

Difference in molar mass and molecular mass

Answer 17

Molar mass is

Atomic mass/molecular mass

BUT in grams

Ig

Question 18

How to find mass with density

Answer 18

Density x volume = mass

*make sure their unit os the same so can potong

Question 19

what is molar mass

Answer 19

Molar mass is the mass of a substance (in grams) that contains
6.02 x 1023 particles and has units of g mol-1
.

Question 20

4 formula to get moles

Answer 20

n=MV/1000
n= m/mm
n=V/stp

density x volume = mass

Question 21

what does molality depends on?

Answer 21

mass in kg of a SOLVENT

Question 22

formula of density

Answer 22

1 to find volume of soltion, the mass that needs to be se is the mass of solution. #NOT SOLUTE

p=m/v

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