Experiment-to determine the empirical formula of Magnesium Oxide

Experiment-to determine the empirical formula of Copper(II) oxide

Try this out 5 - Empirical formula

A sample of aluminium oxide contains 1.08 g of aluminium and 0.96 g of oxygen. What is the empirical formula of this compound?  [ A_r: O, 16; Al, 27 ]

(Ans: Empirical formula = Al₂O₃ )

Try this out 4 - Volume to mass

Calculate the mass of 2.8 dm³ of naphthalene, C₁₀H₈ at STP.                                                                      

[Relative atomic mass: C=12; H=1; 1 mole of gas occupies 22.4 dm³ at STP]

(Ans: 16 g)

Try this out 3 - Mass to molecules

Calculate the number of water molecules in 90 g of water, H₂O.

[Relative atomic mass: H=1; O=16; Avogadro constant, N_A: 6.02 x 10²³ mol^-1]

(Ans; 3.01x 10²⁴ molecules)

Try this out 2 - Mole to atom

1) Calculate the number of atoms in 0.2 mol of Copper atoms.                                

     [Avogadro constant, N_A: 6.02 x 10²³ mol^-1]

(Ans:1.204x 10²³ molecules)

Try this out 1 - The Mole

Try to answer this question. (answers given in the video below)

Try this out 1 - The Mole (Answer)

Explanation to answer  [Try this out 1 - The Mole (Answer)]