1 Calculate the following and show all working:

The relative molecular mass (also called molecular weight) of C₆H₁₂O₆.

The number of atoms of oxygen contained in 4.0 moles of CO₂.

Question 2

Calculate the following

a) The mass of 2.5 moles of O₂.

b) The mass of KI in 120 mL of a 2.5% w/v solution

c) The mass of NaCl needed to prepare 250 mL of 0.0500 M solution

Question 3

Calculate the following:

a) The molarity of a 200 mL aqueous solution containing 0.1238 g of the primary standard potassium hydrogen phthalate (M = 204.2 g mol-1)

b) 8.0 g of Fe (as Fe³⁺) in 400 mL of water as ppm.