Moles, Horrific Moles

Question 0

Mass number

Answer 0

Amount of protons + neutrons

Question 1

Atomic number

Answer 1

Amount of protons

Question 2

Isotopes

Answer 2

Same atomic number

Different mass

Question 3

RFM (Mr)

Answer 3

Add all the RAM’s of a substance

Question 4

Mole

Answer 4

Mass of 1 mole of atoms expressed in grams

Question 5

Avogadro constant

Answer 5

6 x 10^23 atoms of 1 mole

Question 6

RAM (Ar)

Answer 6

Chlorine isotopes
Cl-35 (75%). (35x75) +
Cl-37 (25%). (25x37) = 3550
1 atom = 35.5

Question 7

Solid- mole triangle

Answer 7

Mass
n / RFM

Mass in grams
Number of moles
RFM

Question 8

Solution-mole triangle

Answer 8

n
c / v

Number of moles
Concentration
Volume

Question 9

Gas- mole triangle

Answer 9

V
n / 24000

Volume
Number of moles
24000cm^3 / 24dm^3

Question 10

Empirical formula

Answer 10

% of molecule / RAM = moles of atom

47. 06% oxygen / 16 = 2.94 2.94 / 1.96 = 1.5
48. 95% aluminium/ 27 =1.96 1.96 / 1.96 = 1

1:1.5 —> 2:3 ratio

Question 11

Empirical formula

Answer 11

10g hydrogen
80g oxygen

mass/RAM = amount of atoms
10 /1 =10mol
80 /16 =5mol

Find ratio

Question 12

Amount dissolved (mol)

Answer 12

Volume of solution (cm) x concentration (dm) / 1000

Question 13

Percentage yield

Answer 13

(Yield obtained / rhetorical yield) x 100

Question 14

Mass of product by electrolysis

Answer 14

Current x time = charge

RFM of product x mole of product) / ( moles of electrons x 96500
X charge

Question 15

Electrolysis equation steps

Answer 15

Q=I x T

Charge / 96000 = moles of electrons
(divide this with how many moles of electrons e-) x RAM