Calculations

Question 1

What does RAM stand for?

Answer 1

Relative Atomic Mass

Question 2

What is another symbol for RAM?

Answer 2

Ar

Question 3

What is RAM relative to?

Answer 3

1/12 of Carbon-12

Question 4

Isotope

Answer 4

Same element (same number of protons) but different mass number and number of neutrons

Question 5

How to find RAM?

Answer 5

(Mass of the isotope 1 * it % ….)/100

Question 6

What does RFM stand for?

Answer 6

Relative Formula Mass

Question 7

What is another symbol for RFM?

Answer 7

Mr

Question 8

How to find % of element in a compound?

Answer 8

% mass= mass of the element in a compound/total mass of the compound

Question 9

Mole

Answer 9

A mole is the amount of substance containing in 6x10^23 particles

Question 10

What is the mass of 1 mole of C-12, number of atoms

Answer 10

12g, 6x10^23 atoms

Question 11

Mass=

Answer 11

Mass = Moles x RFM

Question 12

Moles=

Answer 12

Moles = Mass/RFM

Question 13

Empirical formula

Answer 13

Simplest formula of a compound which tells the ratio of atoms in the structure

Question 14

Describe 1 litre in cm3 and dm3

Answer 14

1 litre = 1dm3 = 1000cm3

Question 15

Avogadro’s law

Answer 15

Equal volumes of gases contain equal number of molecules at the same temperature and pressure

Question 16

Molar volume of a gas

Answer 16

1 mole of any gas occupies the same volume as 1 mole of any other gas at the same rtp

Question 17

What does rtp stand for?

Answer 17

Room temperature and pressure

Question 18

Room temperature

Answer 18

25 C

Question 19

Room pressure

Answer 19

1 atmosphere

Question 20

How many cm3 1 mole of gas will occupy at rtp?

Answer 20

24000 cm3

Question 21

Moles of gas =

Answer 21

Moles of gas = volume of gas ( in cm3)/24 000

Question 22

Moles for solution (+symbols + units) =

Answer 22

Moles (n)=c(concentration mmoles/dm^3)*b(volume cm^3)