Question

Determine the empirical formula of an oxide of Iron , which has 69.9% iron and 30.1% dioxygen by mass .

Answer 1

1) The molecular mass of H2O =2 ×(Atomic mass of H2) + 1 ×(Atomic mass of O2)

Atomic mass of H2 = 1

Atomic mass of O2 = 16

=(2×1) + 1×16

= 18 g mol–1
ii) The molecular mass of CO2 = 1×(Atomic mass of carbon) + 2 ×(Atomic mass of O2)
tomic mass of carbon = 12

Atomic mass of oxygen =16

= (1×12) + (2×16)

= 12 + 32

= 44g mol–1

iii) Molecular mass of CH4 = 1×(Atomic mass of C) + 4×(Atomic mass of H2)

= (1 ×12) + (4×1)

=12 + 4

= 16g mol-1.

Answer 2

Answer:

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