Chp 2 - Amount Of Substance

Question 1

Charge of nitrate ion?

Answer 1

NO3-

Question 2

Charge of carbonate ion?

Answer 2

CO3 -2

Question 3

Charge on sulfate ion

Answer 3

SO4^2-

Question 4

Charge on hydroxide ion

Answer 4

OH−

Question 5

Charge on ammonia ion?

Answer 5

NH₄⁺

Question 6

Change of transition metals?

Answer 6

2+ | Fe, Cu, Co, Ni, Zn
3+ | Fe, Cr

Question 7

What is Avogadro constant?

Answer 7

6.02 x10^23 mol^-1

Question 8

Calculation for moles (from mass)?

Answer 8

Amount [n] (mol)= mass [m] (grams)
—————————
Molar mass [Mr] (g/mol)

Question 9

Calculation of moles (from concentration)?

Answer 9

Amount [n] (mol) = concentration [c] x volume [v]

Question 10

{Def of standard solution}

Answer 10

A solution of a known concentration

Question 11

Def of molar gas volume

Answer 11

The volume per mole of gas molecules at a stated temp & pressure

Question 12

Calc of moles from volume with gas?

Answer 12

Amount [n] (mol) = volume [v] (cm^3 or dm^3)
______________________________
Molar gas volume (cm^3 or dm^3 mol^-1)

Question 13

Ideal gas equation

Answer 13

pV= nRT

P- pressure (Pa). n- amount of gas molecules (Mol)
V - volume (m^3). R- ideal gas constant (8.314 J mol^-1 K^-1)
T_ temperature (Kelvin)

Question 14

Convert oC to Kelvin

Answer 14

OC + 273 = Kelvin

Question 15

Calc of % yield

Answer 15

% yield = amount of product actually produced (mol)
_________________________________________. X100
Maximum amount that could be produced (mol)

Question 16

{def of % yield}

Answer 16

A measure of the amount of product that a reaction actually produces compared with the maximum amount of product the reaction could produce

Question 17

Calc of atom economy?

Answer 17

Atom economy = mass of useful products
—————————————. X 100
Total mass of products produced

Question 18

{def of atom economy}

Answer 18

Measure of the % of starting materials that end up as useful products

Question 19

Conversion of dm3 to m3
(For ideal gas equation)

Answer 19

dm3
————— = M3
1000