M2 Topic 1,2,3 : Chemical Reactions and Stoichiometry, mole concept,, concentration and molarity

Question 1

what does the law of conservation of mass state

Answer 1

mass in a chemical reaction is neither created or destroyed

Question 2

what is the symbol for moles

Answer 2

n

Question 3

how do you convert moles into molar mass

Answer 3

Moles (n) x formula mass = molar mass (g)

Question 4

how do you convert molar mass into moles

Answer 4

molar mass (g)/formula mass = Moles (n)

Question 5

how do you convert moles into vol of gas (0°)

Answer 5

mole (n) x 22.71L = vol of gas (0°)

Question 6

how do you convert vol of gas (0°) into moles

Answer 6

vol of gas(0°)/22.71 = mole (n)

Question 7

how do you convert moles into vol of gas (25°)

Answer 7

mole (n) x 24.79 = vol of gas (25°)

Question 8

how do you convert vol of gas (25°) into moles

Answer 8

vol of gas (25°)/24.79 = mole (n)

Question 9

how do you find the number of particles with moles

Answer 9

Moles(n) x Avogadro’s constant (Nₐ) = No of particles

Question 10

how do you find the moles with the number of particles

Answer 10

No of particles/Avogadro’s constant (Nₐ) = Moles(n)

Question 11

how do you find concentration with moles

Answer 11

moles/volume(L) = concentration (mol/L)

Question 12

how do you find moles with concentration

Answer 12

concentration x volume = moles

Question 13

what equation do you use to calculate values for dilution

Answer 13

concentration₁ x volume₁ = concentration₂ x volume₂