Question

Calculate the mass of 100 molecules of copper carbonate. [Atomic mass of Cu = 63.5 u]

Answer 1

Answer:

18900u

Explanation:

copper carbonate formula = Cu2(OH)2CO3

Molar mass of copper carbonate = 2*63.5 + 2*(16+1) + 12 + 3*16

                                                       = 127 + 34 + 12 + 16 = 189

Moles = Mass/Molar mass

Mass = Mole * Molar mass

Mass = 189*100

Mass = 18900u

Answer 2

Given,

The molecule of Copper Carbonate is given.

Number of molecules = 100

The atomic mass of Cu = 63.5 u

To find,

We have to calculate the mass of 100 molecules of copper carbonate.

Solution,

The mass of 100 molecules of copper carbonate is12355 gm/mol.

We can simply calculate the mass of 100 molecules of copper carbonate by adding the molecular masses of all the atoms present in the molecule.

The molecular mass of 1 molecule of copper carbonate =  Cu + C + 3O

                                                                                            =  63.5 + 12 + 48

                                                                                            = 123.55 gm/ mol

Mass of 100 molecules of copper carbonate = 100 * 123.55

                                                                          = 12355 gm/mol

Hence, the mass of 100 molecules of copper carbonate is 12355 gm/mol.