Calculating Amounts Of Chemiclas

Question 1

What is a mole?

Answer 1

Unit of chemical amount or amount of substance

Question 2

1 mole is equivalent too…

Answer 2

The amount of substance that contains as many particles as there are atoms in exactly 12g or carbon-12

Question 3

What is the value of Avogadro constant ?

Answer 3

6.02*10^23

Question 4

What is the unit for Avogadro constant?

Answer 4

Mol-1

Question 5

Define molar mass

Answer 5

The mass (g) of 1 mole

Question 6

What is molar mass of an element?

Answer 6

The molar mass of an element is the same as its relative atomic mass

Question 7

What is molar mass of molecules ?

Answer 7

The molar mass of molecules is the same as an element or compound of relative formula

Question 8

How do you calculate amount of substance (the number of moles) in a solution?

Answer 8

Moles= mass of substance ÷ molar mass

Mol = Mass ÷ RMA

Question 9

How do you calculate the amount of substance in a solution ?

Answer 9

The amount of substance in a solution = volume of solution × concentration

Question 10

True or false:

The amount of substance in solution can also be expressed in parts per million (ppm)

Answer 10

True

Question 11

How to calculate ppm

Answer 11

Ppm = (number of parts of the chemical ÷ number of parts it’s contained in) × 10^6