Quantitative chemistry

Question 1

How do you calculate RAM

Answer 1

Work out how many atoms of each element there are in the chemical formula and add them together

Question 2

What is a mole

Answer 2

Number of atoms/particles

Question 3

What’s the equation linking mass, moles and RFM

Answer 3

Mass = moles x RFM

Question 4

What is the equation for the avogrado constant

Answer 4

number of moles = number of atom / 6.02x10^23

Question 5

What is the difference between excess and limiting

Answer 5

Excess - the amount of a reactant is grater than the amount that can react
Limiting - the reactant in a reaction that determines the amount of products formed

Question 6

How do you balance numbers from reacting masses

Answer 6

Write the equation out
Calculate number of molecules
Divide all the numbers by the smallest

Question 7

What is the equation linking concentration, mass and volume

Answer 7

C = m/V

C - concentration, measured in grams per cubic metre (g/dm^3)
m - mass, measured in grams (g)
V - volume, measured in cubic metres (dm^3)

cm^3 - dm^3 = /1000