Quantitive

Question 1

What is the relative molecular mass of an element?

Answer 1

The relative molecular ass of a substance is the sun of the masses of all the atoms present in the formula of that element or compound - Mr

Question 2

How do you calculate the percentage of an element in a compound?

Answer 2

% of an element =

Mass of the element in the compound / Relative Formula Mass X 100

Question 3

What is a mole?

Answer 3

The relative formula mass of a substance in grams is known as the mole of the substance.

Question 4

How many particles are in one mole of a substance.

Answer 4

One mole of a substance is 6.02 X 10 (to the power of 23) particles of the substance. It is obtained by weighing out the RAM or RFM in grams

Question 5

What is the equation for Moles:

Answer 5

Moles = Mass of a substance / RAM or RFM

mass in grams always

Question 6

What is the equation to find the Mass of a substance?

Answer 6

Mass = Moles X Ar or Mr

Question 7

Why can we interpret chemical reactions quantitatively?

Answer 7

As no atoms are made or lost