Moles

Question 1

what is the avogrado constant>

Answer 1

6.02 x 10^23

Question 2

what is the relative formula mass?

Answer 2

mass of a formula unit relative to mass of an atom of carbon-12

Question 3

what is relative molecular mass?

Answer 3

compares the mass of a molecule with the mass of an atom of carbon-12

Question 4

how do you work out moles by concentration and volume?

Answer 4

mole = concentration x volume (dm3)
mole = concentration x volume (cm3) / 1000

Question 5

what is the standard solution?

Answer 5

a solution of known concentration

Question 6

what is molar gas volume?

Answer 6

volume per mole of gas molecules at stated temperature and pressure

Question 7

what is the RTP?

Answer 7

20 degrees
101 kpa

Question 8

what is the ideal gas constant?

Answer 8

pV=nRt
t = temperature = kelvins
p=pressure = pa
v = volume = m3
r = 8.31
n = moles

Question 9

formula for atom economy?

Answer 9

mass of desired product/ mass of total product / 100

Question 10

the formula for percentage yield?

Answer 10

actual yield/theoretical yield x 100

Question 11

why may theoretical yield not be achieved?

Answer 11

1) reaction not fully completed
2)side reactions may have taken place along main reaction
3)purification of product may result in loss of some product

Question 12

what does efficiency of reaction depend on?

Answer 12

atom economy and percentage yield