chapter 3 amount of substances

Question 1

How many atoms are in a mole?

Answer 1

6.02x10^23 atoms

Question 2

what is the equation linking mass(m), molar mass(Mr) and moles (n)?

Answer 2

n=m/Mr

Question 3

what is the empirical formula?

Answer 3

ratio of atoms or ions in a structure
e.g. C2H6 = CH3

Question 4

look over water of crystallisation working out steps

Answer 4

😛

Question 5

what is the equation to work out moles of a liquid?

Answer 5

n=CxV

Question 6

what is a standard solution?

Answer 6

a solution of known concentration

Question 7

what is the ideal gas equation?

Answer 7

pV=nRT (v in m^3) (T in K) (p in Pa)

Question 8

how do you work out kelvin?

Answer 8

Celsius + 273 = Kelvin

Question 9

what is the ideal gas constant?

Answer 9

R=8.314

Question 10

How do you work out % yield?

Answer 10

(actual yield/ theoretical yield) x 100

Question 11

how do you work out atom economy?

Answer 11

(Mr of desired products/ Mr of all products) x 100

Question 12

when calculating the moles of a hydrated salt, how do you work out Mr?

Answer 12

use the Mr of the salt but not the water