Calculations

Question 1

What is the Avogadro constant, NA

Answer 1

the number of particles per mole: 6.02 × 10^23 mol^–1

Question 2

What is molar mass

Answer 2

the mass per mole, units

g mol^-1

Question 3

What is Molar gas volume

Answer 3

gas volume per mole, units

dm^3 mol^-1

Question 4

State the ideal gas equation and the gas constant

Answer 4

pV=nRT
where p is measured in pascals (1atm = 101kPa), where V is measured in m^3, n is moles, R is the gas constant which is 8.314, and T is measured in Kelvin.

Question 5

How do you calculate error in apparatus

Answer 5

For analogue equipment, +/- half of the smallest graduation, for digital equipment, +/- the accuracy of the display

Question 6

How do you calculate percentage uncertainty

Answer 6

(error*times used)/measurement, all timesed by 100

Question 7

How do you convert from gdm^-3 to moldm^-3

Answer 7

gdm^-3=moldm^-3 * molar mass

Question 8

How do you calculate percentage yield

Answer 8

actual yield/theoretical yield, all timesed by 100

Question 9

How do you calculate atom economy

Answer 9

The Sum of Mr of desired products/ the sum of Mr of all products, all timesed by 100