• Congratulations to the Class of 2024 on your results!
    Let us know how you went here
    Got a question about your uni preferences? Ask us here

Year 11 moles (1 Viewer)

Gtsh

Member
Joined
Jun 22, 2021
Messages
55
Gender
Female
HSC
2023
I need help with these 2 mole questions from the person book.

Find the relative atomic mass of nickel if 3.370g nickel was obtained by reduction of 4.286g of the oxide (NiO). You may need to refer to the periodic table at the end of this book.

16 4.150g tungsten was burned in chlorine and 8.950g tungsten chloride (WCIJ was formed. Find the relative atomic mass of tungsten. You may need to refer to the periodic table at the end of this book.

Thanks
 

jimmysmith560

Le Phénix Trilingue
Moderator
Joined
Aug 22, 2019
Messages
4,578
Location
Krak des Chevaliers
Gender
Male
HSC
2019
Uni Grad
2022
Would the following working help with the first question?

m(Ni) = 3.370 g

m(NiO) = 4.286 g

So m(O) = 4.286 - 3.370 = 0.916 g

n(Ni) = n(O) since n(Ni) : n(O) = 1:1

n(O) = m/M = 0.916/16 = 0.05725 mol = n(Ni)

Now M(Ni) = m/n = 3.370/0.05725 = 58.86 g/mol (this is the molar mass)

The relative atomic mass of Nickel is 58.86 (≈ 58.9) atomic mass units.
 

Gtsh

Member
Joined
Jun 22, 2021
Messages
55
Gender
Female
HSC
2023
I get everthing except the 'n(Ni) = n(O) since n(Ni) : n(O) = 1:1'. Is it because NiO have a 1 to 1 ratio
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top