Moles

Question 1

What is the symbol for mole?

Answer 1

Mol

Question 2

What is the mass of one mole of a substance numerically equal to?

Answer 2

RFM

Question 3

What is the definition for avogadros number?

Answer 3

Exactly how many atoms, ions or molecules are in one mole of a substance

Question 4

What is the equation for the number of moles?

Answer 4

Moles = mass/ RAM

Question 5

What is the equation for the percentage element by mass?

Answer 5

% element = (RAM x number of atoms) / RFM ) x100

Question 6

What’s the equation for RAM with isotopes?

Answer 6

Sum of (isotope abundance x isotope mass) ) / sum of abundance of all isotopes (usually 100)

Question 7

What is the simplest form of coefficients equal to?

Answer 7

Ratio of moles

Question 8

How to use moles to balance the equation?

Answer 8

• divide mass by RFM to calculate number of moles in each
• divide each number of moles by the smallest coefficient to determine most simplified ratio
• molar ratio is then equal to the coefficients

Question 9

What are the effects of limiting reactants?

Answer 9

• makes one reactant in excess
• the reaction will only go as far as the number of moles the limiting reactant allows

Question 10

What are the limiting factors of the concentration of solutions

Answer 10

• if you double the volume, you halve the concentration

Question 11

What is the chemical formula for a carbonate?

Answer 11

[CO3]2-