Moles Flashcards
what is the avogrado constant>
6.02 x 10^23
what is the relative formula mass?
mass of a formula unit relative to mass of an atom of carbon-12
what is relative molecular mass?
compares the mass of a molecule with the mass of an atom of carbon-12
how do you work out moles by concentration and volume?
mole = concentration x volume (dm3)
mole = concentration x volume (cm3) / 1000
what is the standard solution?
a solution of known concentration
what is molar gas volume?
volume per mole of gas molecules at stated temperature and pressure
what is the RTP?
20 degrees
101 kpa
what is the ideal gas constant?
pV=nRt
t = temperature = kelvins
p=pressure = pa
v = volume = m3
r = 8.31
n = moles
formula for atom economy?
mass of desired product/ mass of total product / 100
the formula for percentage yield?
actual yield/theoretical yield x 100
why may theoretical yield not be achieved?
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
what does efficiency of reaction depend on?
atom economy and percentage yield