Question

5. i) Calculate the number of moles in 228g carbon. (Atomic mass of Carbon is 12 u
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Answer 1

Molar mass of Co2 = 117.8664 g/mol

Answer 2

ANSWER ⤵️

a) 12 g of carbon

Given mass : 12 g

No. of moles=Given mass/mole mass=12/12=1mole

No. of molecules = No. of moles × Avagadro No.

=1×6.22×10²³

=6.022×10²³molecules

b) 64 g of oxygen

Given mass: 64 g

No. of moles=Given mass/mole mass =64/ 16=4 mole

No. of molecules = No. of moles ×Na=4×6.22×10²³=24.088×10²³molecules

c) 72 g of water

Given mass =72 g

Molecular mass =18 g

No. of moles = 72/18=4 mole

No. of molecules =4×6.22×10²³

=24.088×10²³molecules