Equations And Number Stuff

Question 1

How do you calculate RAM with mass number and percentage abundance?

Answer 1

(%abundance x mass) +
(%abundance x mass)
ALL DIVIDED BY 100

Question 2

How do you calculate percentage change in mass?

Answer 2

(difference / initial) x100

Question 3

How much cm3 is equal to one dm3 ?

Answer 3

1000cm3 = 1dm3

Question 4

How much is a score?

Answer 4

20

Question 5

What is avogadro’s constant?
(Or how much is a mole?)

Answer 5

6.02 x 10^23

Question 6

What equation links RFM, moles and mass?

Answer 6

Mol = mass/Mr

Question 7

What equation links mass, concentration and volume?
-provide units

Answer 7

Concentration = mass / volume
(g/dm3) = g / dm3

Question 8

How do you calculate percentage yield?

Answer 8

(Actual yield / theoretical yield) x100

Question 9

How do you calculate percentage atom economy?

Answer 9

(Mr of desired product / Mr of total products) x100

Question 10

What is the molar volume of gas?

Answer 10

24 dm3

Question 11

How much is room temperature (in atmospheres and kilopascals) ?

Answer 11

1 atm
OR
101 KPa

Question 12

What equation links volume, molar volume of gas and moles?

Answer 12

Moles = vol / 24

(Because 24 is the molar volume of gas)

Question 13

How do you calculate titration?

Answer 13

n = C x V

n - number of moles
C - concentration (mol/dm^3)
V - volume (dm^3)

Question 14

How many ml is 1cm^3?
How many dm^3 is 1 litre?

Answer 14

Both 1